Well its a 115 gal tank, with Wet dry, pro skimmer, Emperor 350 outside filter. Water conds is: 1021 sal 0 nitrites, 0 nitrates, 0 ammonia, PH 8.2 I add fish all the time. I'M A sCUBA dIVER. tHE lAST THING I added was a Maroon clown. He seems to still be doing well. I have a Flame angel also...