I have a ? I just picked up a used set up 2x175 MH with 2x65 PC Hamilton retro . Heres my ? I have a 210 FOWLR with PC now should I use this on the tank or not .
Technically you don't have to. All it will do is speed up your algea growth, up the heat level, and stress out the fish.
But if you plan on switching to a reef in the future that is an asset!!!