I'm not sure ... I think it may depend on how big your total system is. I CAN tell you that I am currently in the middle of trying to sell my 2 rBTA's b/c of the gigantea I introduced to the tank last month. Things were thriving. But as soon as the gig was intro'd, a lot of LPS started receding, and favia growth began slowing down. All 'nems (BTAs and gig) appear healthy though. Just in case, I'm getting rid of the BTAs in hopes that the rest of my corals perk up again. Total system is 56 tank + 20 sump. hope this helps!