Not nessesarly thats 6 to 7 watts a gallon. Start out with a small 1 then see what happens. You also have to add phytoplankton of some sort to your tank.. What else do you have in your tank? I didnt think I could have a clam either
I run two pc lights on my tank 265 watts each whats the watts per gallon if I had a 90..5.8 watts per gallon 4 daylights 10000 and 4 atinics 460 deep blue