I
would say two engineer gobies, but I bought those while I was at home this summer, and put them in my buddy's tank for the time until I went to school. So instead of them destroying the aquascape in my tank, they did it in his
They were taken back to the store a few days after they were bought.
In my tank, I regret my purple lobster. HUGE PAIN. He cost me twenty bucks to bring home, and since then, about 150 more. He killed my Heniochus Butterfly, my gorgeous Volitan Lionfish, and my Yellow Tang. After the Tang, I finally got smart and went to the pain of catching him and I put him in my 3 gallon. The only thing he has to terrorize in there are my boxer crabs, and I don't think he's going to want anything to do with them (if he can ever even find them).