If I'm doing my math right, then you have 1.4 watts per gallon in your tank. I have a rather large bubble tip in a 37 gal with 1.7 watts per gallon. He seems to be doing ok, but I can tell you from expierence that they will NOT stay where you put them. Now, I am far from an expert on this subject, but I feel that my anenome is doing ok, so I would assume if your rock is high enough, and your water quality is good enough, that you should be ok. If I am wrong, someone jump in QUICKLY please!