When can an Anenome be added?

[Gools]

I think I steared him away from buying one. But now he is going to go buy a couple of cleaner shrimp. But you are right he does want to, buy, buy, buy. he wants the finding nemo tank. with a hippo. And it's only a 50g tank. I keep telling him it's to much, he already has 7 fish in there. chromis's and percs. I figure he wants what he wants, nothing I can do but give him the best advice available. Thanks guys, and gals.