Most disappointing Livestock Purchase?

[hummer]

When I first started out I bought a whole bunch of Damsels. They got really big and attacked most fish I put in. Had to remove all the rock to catch them all to give to the pet store. When I started up my new tank I stayed away from them. As for corals I would say Kenya Tree. That thing grew out of control. My tank was filled. I removed them all but they are starting to come back. Sold the first batch to LFS and got some good money