How much PC lighting do you have over what size tank. I made the mistake of trying a BTA under 96w PC in a 55g tank. Fortunately, I managed to keep it on life support with regular feedings until I upgraded my lighting. I'm guessing you can do just fine with PC lighting, but you need to make sure you have enough. I, unfortunately, don't really know what the answer to that question is, other than in my case, I didn't have enough.