My husband is into the strange and unusual when it comes to his FO tank. Currently he has a 75g that has a volitan, SF eel, longhorn cow, watchman and a couple urchins. We are going to be upgrading the size for his buddies but I keep finding conflicting info on what size tank. I have read 100 to 180 on Moo (that's his cow). We were wanting something more like a 110 or a 125. Also, how long before Moo gets to big for this tank? 1 year or less ? Good thing I can restarin myself with my 55g reef although I plan on taking his 75 when he gets done