Hi everyone!
I have an Aqua One 620 Litre Bow Front Tank, with 6 Angelfish, 4 Boesmani Rainbowfish, 4 Lake Kutubu Rainbowfish, 4 BN's and 5 Corydoras.
It has a Tetra Complete Plant Substrate covered with 3-4" of Hagen Fine River Gravel. I dose as follows...
I make up a solution of 40g K2SO4...