Greetings to all,

I recently experience a massive outburst of brown algae. I did some research and found out that I should out some phosphate remover in my filter. So I bought Rowaphos.

Here is the question. In the instruction, it states use 100ml Rowaphos for up to 800L of freshwater. But my tank is only about 65L. Base on simple math ratio, means that I have to use 8.1ml of Rowaphos for my tank.

Is that correct? Doesn't it look too little?