great again
everything was very fast
the fertilizer is great like the rest
thanks Asabi team

I've been using it for a few weeks alongside the NPK fertilizer from Aqua Rebell and the values are running perfectly stable and could be dialed in really well with these two fertilizers. So I'll keep choosing these fertilizers. Highly recommend.

Works excellently for daily fertilization. I also use other fertilizers from Aqua Rebell. The Aquasabi service is very good, too.

Application: easy
Reliable
Effect: very good
Pushes algae down
Promotes growth
Daily application

Using it for the first time and very satisfied

My nitrate level regularly drops below 5 and I have big problems keeping nitrate above 10 (despite fish!)

Probably because I have an anaerobic zone in the substrate... I don't know who else would eat up my nitrate, the rapid filter certainly isn't it, and the plants don't look fat enough for that either.

As a result I have to dump in such amounts of N that with conventional N fertilizers I get K surpluses and then dust algae plagues.

Here the GH Boost helps me enormously!

I would also recommend it if you have a low GH in your tap water ( = little magnesium lime) and the new growth of your plants looks yellowish or pale despite Fe fertilizer. That can be magnesium deficiency, which I find hard to tell apart from iron deficiency.

Nice that there's a fertilizer here that contains no potassium. Also exemplary service.
EasyLife Fosfo is also recommended for anyone who needs a pure phosphate fertilizer.

Ever since I got this fertilizer my plants have been taking off like crazy. Before, I always worked with NPK and Basic Iron from Aquarebell. Eventually nitrate ran short, though. Bought Gh Boost N in addition and since then the plants have been shooting up. After 2-3 weeks I get to trim the Hra. Simply brilliant!

I use the Aqua Rebell fertilizer in my biggest aquarium (400 liters).
Thanks to good filtration I don't need much of it, but it visibly does the plants good.
In a well-planted tank it's definitely a must.

NPK brings a lot of K into the water! If you reduce it a lot, N falls short. That's why GH Boost N !

Flawless nitrogen fertilizer that also supplies a recommended Ca:Mg ratio. So the fertilizer raises the GH. If you don't want that, you should switch to a nitrogen fertilizer without additives. Good value for money.

Perfect leveling of my levels through daily fertilization.
I prefer dosing individual nutrients in the aquascape and GH boost N is the perfect choice.

I'm very satisfied with the delivery, very fast and on time as announced. Great products, plants were excellently packed and arrived intact.
Thanks, happy to order again.

With GH Boost N I manage to raise my sodium value in a very targeted way. Since I already have enough potassium in my drinking water, I don't burden the water any further and can still improve the best nutrient content for my aquatic plants with it. The Aquarebell products are developed very well for the individual needs of different water conditions. That makes a very well-adapted fertilization method tunable for everyone.

Since I have too little nitrate in my tap water, this is my most important fertilizer in the aquarium, so that I don't get green algae.
The dosing pump is great and the price (1€) for it is fair.

In my long decades as an aquarist I had more of a “fertilizer = algae” problem. Thanks to Flowgrow and working through the individual water parameters, it was clear to me that I have to fertilize in a targeted way instead of using NPK.
Particularly advantageous with all Aquarebell fertilizers is the exact information on what's in them and how to dose with or without CO2. The different container sizes are great too, since they cover every need. With my 550l aquarium my needs are completely different and I don't have to constantly throw away plastic bottles.
My algae problems have declined significantly since the targeted fertilization and will hopefully soon be history. That's exactly what I had hoped for - instead of dumping in anti-algae products, the cause (a lack of certain nutrients) was eliminated.
Positive side effect - the plants show completely new sides of themselves.
You can tell: passionate aquarists with a great understanding of water chemistry and light in relation to plant needs have developed something here that can serve the individual needs of every aquarium. The whole series is exactly what the big companies haven't delivered for years.

Highly recommended in combination with or alongside other Aqua Rebell products, and it's important to always observe the dosages.

The product was well packed and arrived safely. I chose GH Boost N because it contains no potassium.

This supplement to the fertilizing system isn't always necessary, but after changing fertilizers I had a bit of an imbalance in the nutrients, and this product helped me with that. Since the nitrate level in this one is a bit higher, it helped me with my acute nitrate deficiency. I haven't used up all of the 500ml, but in my second tank I've never fertilized so far (since it's really just a tank where I stick plant trimmings from the big one (too good for the compost)) so I'll start fertilizing there too and maybe the rest will find use there.

Have been using this fertilizer for a year and find it optimal for my tank ! Started with NPK in April 2016, then switched to Spezial N and Basic Nitrat. GH-Boost N ( K-FREE ) brought the best result of all . EXCELLENT!*****

I use the complete individual components from AR to fertilize 350l. Since I have a lot of potassium in my tap water, I chose a potassium-free variant of the nitrate fertilizer. Absolutely recommended, only criticism: Ca in the fertilizer. My source water is very hard. If you don't have that, you can ignore this point.

In my high-light tank the large-leaved plants developed small crumpled leaves after the 6th week, even though I was fertilizing with NPK and complete iron fertilizer. Then I ordered Advanced GH Boost and after one week of fertilizing with NPK & GH Boost the plant growth was perfect again. I'm leaving out the complete iron fertilizer for now, the first black beard algae were the sign of unused iron in the water. The growth of black beard algae has stopped completely, the other plants are growing splendidly.

I moved away from this fertilizer and switched to ADA products.

It's good and does its job, that much is certain.

Have been using the fertilizer for approx. 3 months.
Since my potassium level is always quite high even though I don't add any extra potassium, I chose this potassium-free fertilizer. The plants grow great in combination with the phosphate fertilizer from AR

Plant growth improved quickly and the annoying algae of every kind have almost completely disappeared. Great solution! Highly recommend this product.

My tank always has a high potassium level between 10 and 20 mg/l. Surprisingly, it even rises over the course of the week. For the daily compensatory fertilization of N, this fertilizer is therefore very helpful for me. With other N fertilizers I would constantly be adding potassium and over time end up oversaturating the tank. I also use this one for the weekly fertilization after the water change, in combination with the Makro Basic Nitrat and the Special N, to bring the potassium level to the target.

I like the Aqua Rebell Advanced GH Boost N because it doesn't add any potassium. Anyone who wants to raise NO3 in a targeted way is in good hands with this product.

Perfect nitrate fertilizer.
And without potassium.
Perfect for my low-nitrate aquarium. 👍
The GH Boost N is the most-used fertilizer for my 60 l tank.

Perfect nitrate fertilizer.
And without potassium.
Perfect for my low-nitrate aquarium. 👍
The GH Boost N is the most-used fertilizer for my 60 l tank.

The fertilizer works great, value for money is fine.
I switched my 450 l tank completely to Aqua Rebell 1.5 years ago
(FE, Flowgrow, PO4, NO3-Boost+FE-Spezial), and have been
100% satisfied ever since.
So it's a 100% recommendation, too.

Fast delivery and great quality! Highly recommend. In addition, all questions were answered quickly and reliably, so you can't run into any problems.

I use the fertilizer in combination with the NPK and the Estimative Index. In my opinion the best nitrogen fertilizer if you use soft water for water changes and already have enough potassium in the tank.

I prefer it to the Spezial N because it keeps dust algae away. All plants react very positively and the water stays beautifully clear. I add urea at most once a week on top of it, while I use the GH BOOST as a daily fertilizer. Since then the plants are usually pearling nicely before noon!

My absolute recommendation.

My plants grow like crazy with this fertilizer, and so far I haven't had any algae problems like I did before with an NPK fertilizer from another shop

A full five stars. The 1 liter bottle stands firmly and the cap is tight, it could even be stored lying down. I use a combination of Aqua Rebell - Advanced - GH Boost N, Makro Basic Estimative Index and Mikro Spezial - Flowgrow. After just 1 week I could see a clear improvement in the plants, and after 14 days I discovered new leaves sprouting on my Nymphaea gardneriana "Santarem". I'm thrilled. Thank you so much, Aquasabi.

Ever since I started using this fertilizer I can literally watch my plants grow!
And a big plus: it's potassium-free, which you usually bring in more than enough of through other fertilizers!

I actually only wanted to give 4 stars because it doesn't say by how much GH it hardens the water (if I used the nutrient calculator correctly, by 0.07 GH per 1 ml of Advanced GH Boost N in 50 l of aquarium water). But a potassium-free NO3 fertilizer is something special, the price is OK and everything else is right - so 5 stars!

Since there's already too little nitrate in my tap water, my plants grew very poorly. Now I use it in addition to the NPK fertilizer in normally stocked tanks, or on its own in tanks with phosphate, to create a good balance.

For me the perfect fertilizer without potassium. I've finally gotten my NO3 value into a good range with it! Very happy!

Since I had quite a lot of potassium in the tank and didn't want to add urea, this fertilizer came at just the right time. I also like that it brings Mg and Ca, which suits my soil tank.

For me a very good fertilizer

Hello Aquasabi team,

highly recommended for very hard water!
And the delivery, as always, "lightning fast"
Keep it up, guys :-)

A lot of people have been waiting for this. All that's missing now is a drop checker like the one for CO2, then fertilizing with nitrate would be a breeze. Thanks for always trying to fulfill our wishes.

A very worthwhile fertilizer for me so that the potassium levels don't rise too much. The plants thank you with fast growth after only a short time of use. I mainly use it for shock dosing as well.

Great fertilizer when there's an excess of potassium in the tank. It helped wonderfully against green algae for me. Shopping at Aquasabi is always a pleasure!

A great fertilizer after only a short time of use. First results already visible. Highly recommend. Some stem plants that were "stunted" are finally putting out leaves again! Excellent!