Starting RowaPhos amount for 20g cube AIO tank

[Stoichiometry]

Hi, currently trying to establish a better nitrate to phosphate ratio and haven't been successful with just feeding a bunch of high protein frozen food. Looking to try some rowaphos in a media bag in my return pump chamber. How much weight should I start out with? 10-20 grams? Can I put the media bag in my filter cup in my first chamber in front or below floss?


I recently got rid of a bad green hair algea outbreak and the tank was clear for a couple weeks and coral are thriving and growing like crazy. Suddenly i'm starting to see diatoms on the sandbed and the start of some strands of GHA on the rocks. I did some param testing today and i'm at:

Nitrate: 0.2ppm
Phosphate: 0.1ppm

I'm running a pretty heavy HOB skimmer so i'm guessing that sucking out a bunch of nitrates. When I first noticed this ratio was off, phosphate was 0.06 and nitrate was about the same 0.2ppm. I started feeding a lot more with high protein frozen food but my phosphates have risen as a result.

How much rowaphos would you recommend to start with if running it from a media bag in a 20 gallon tank? I also have some neonitro + macrobacter that I haven't given a try yet.

 

[Mr. Mojo Rising]

.1 phosphate level, IMO, is perfect (for my tank anyway)

But if you do use the GFO, on such a small tank, I would suggest to start with 25% of the recommended dosage, then adjust accordingly. That stuff is very strong, and you really don't have much room to go down too much.

Consider the liquid phosphate remover, I find it easy to drop just one single drop into my smaller tanks. It drops the phosphate by about.5, just the one drop.

 

[Mr. Mojo Rising]

Consider the liquid phosphate remover, I find it easy to drop just one single drop into my smaller tanks. It drops the phosphate by about.5, just the one drop.

Silly me, I meant .05
One drop in my 15, 20, or 40 gallon drops phosphate by about .04~.05
Sorry for that lol