i am about half hiding behind that tree, depending on the situation i guess and the fish .several months ago i didnt not q a firefish it got ich and spread it around. but on the other hand i have a lionfish who desperitly needed a large tank and good water quality i put him in the 120 the poor thing and he is doing much better now had to do the same with a hyper moray eel.sometimes you have to use your best judgement.