nothing,after I moved I didn't set it up again,I'll probably set it up again later this year. i don't know why you people say the water conditions will be bad because of the lion. The lion is small,and I don't overfeed it,My Ammonia is 0ppm,Nitrite 0ppm,Nitrate 10ppm,PH 8.3.All of the fish are healthy,everyone gets along,I change about 10gallons of water every two weeks.I have 5 serpant stars that clean all the junk in the tank,and a bunch of other stars. If all of these inverts are doing fine why wouldn't the Angel,Angels can stand Nitrate levels to 25ppm. and not be effected,and my levels are no where near that.With the 125#'s of live rock,the 100#'s of live sand,Berlin Turbo Skimmer,UV sterilizer,Wet/Dry,Powerheads,and a aquaclear powerfilter,my water parameters are always good.Whats in your 75gallon,what kind of filtration do you have on it?What fish are in it?You don't know what your talking about.Bank on that.