Join Date: Apr 2003
Location: Mid-Hudson Valley, New York
Supposedly, addition of PO4 will drive more NO3 uptake, if the plants were PO4 limited. Maybe in really high amounts, the plants were growth-inhibited. How's that for a totally ignorant guess?
Anyway, I should think the users of the NO3 would become obvious at trimming time. Java fern is the only "slow" grower in the tank that I see.