Here's a puzzle. In the morning my tank phosphates are around 0.60 mg/l.
In the evening they shoot up to 2.20 mg/l. I feed once a day and very
little. I even have Rowaphos in my canister filter. The tank is planted.
I can only presume that the algae eaters excrete pure phosphate from the
algae they eat which then gets adsorbed by Rowaphos overnight.


Nikki