Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Good that you got several- now you can customize the dosing of N, P, K and traces to get the right balance in your tank.
I would get Seachem Flourish Iron for the iron. Do not add more and more trace minerals just because the iron is missing. Traces can be toxic in excess.
Compare the amounts of active ingredients in Trace and Comprehensive. The amounts of N, P and K in Comprehensive are quite low. But the other ingredients (mostly trace minerals) are a bit higher in the comprehensive product. Might be a better buy.