bule hippo

ok so i had my tank set up without any new fish or inverts for 2 yrs on july 5th i woke up and my fish were all dead. so i did a 30 gallon water change and took a sample to the local fish store he said that all the water tested good and was great on the water that i took out fro samples after the change. he said that it was the pink seecumber, so i went home and foun it with its insides hanging out!! so waited a few weeks and did some more water changes and put in 2 chromis, all was good. wated a few more weeks and went and got the start of restocking the fish, set true percs, blue hippo, yellow tang, and a flame angel. so then i notice that the two clowns are taking home in one of my frogspan, now the blue is also trying and is getting stung by it what shpoud i do?????

 

I think he will learn the lesson that he is a damsel but not a clown damsel.

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