Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I would give the natural processes a week or two, say a couple of water changes.
Fish food supplies some P, and the plants are removing it. Let this cycle stabilize, but monitor it. If you find the P is crashing, then start dosing. If you find it is climbing too fast, then see what other nutrients might be missing. The plants should be able to keep up with reasonable fish feeding of a sensible stocking level.
They need light, carbon and all the other nutrients, of course.
Fish food supplies a fair amount of N, P and most traces.
Water changes should supply enough Ca, Mg and some other minerals. (a GH of 3 degrees or higher is good)
Usually carbon, potassium and iron are the first elements to think about dosing. These are the ones most often in short supply when the plants really get going.