Have a 65 gallon tank with a lot of plants. T5 lighting @ 6700k. I do a 50% PWC weekly. Nitrates run around 5 ppm. Nitrites and ammonia 0. Tank is well stocked with fish. Plants are rotala, amazon sword, jungle Val, water sprite, and anubias.
No CO2.
Should I be dosing with ferts?
If so...