7 years for a potters is good! I wish I had a potters, beautiful fish!! Yes I heard butterflies are a little hard on the corals haha. Maybe a copperband or pyramid would be better?Had both a flame and potters angel in my 100gal reef from 2000-2007. Model citizens until I lost the tank due to a power outage. Had a beautiful mitratus butterfly in my reef a few years back. Never saw a polyp again. Corals looked fine. Just no polyp extension.