I have a 125 gallon tank with 2 clown fish already and 1 hippo tank. At the moment I have moved them into my 90 gallon tank to do some work on my 125. My wife wants me to get a few more of each but I am wondeing will this cause any problems?? If I get them I will buy the same size hippo and a little bit smaller clown fish than the male one and add them at the same time. I was thinking of having 4 hippo's in total and maybe 6 clown fish in total but not sure about causing any stress to any of them. I know at fish stores you see them all the time but they are added all together at once with no real area and mine I have had for over 3 years and the hippo for 2 years. Anyone with a good answer please or has tried doing this before. Thank you