Silvertip Tetras mass murderers

[aquachris]

I have a bunch of silvertip tetras I got from my mother in law.  She originally had these in a 55g will a whole bunch of guppies and other odds and ends (she just buys things and doesnt check or consult).  Anyhow, she claims they have killed all her guppies in the tank, and she was going to destroy them.  Naturally I couldnt allow such a thing and got them now in a 20g long I have.   There are 13 or 14 of them (little buggers move too fast and hard to count).

Anyhow, any recommendations on what things I could add they wont murder since they have such a history?  I know guppies are a no-no (even beyond her "experience").  I also would love to toss a snail or two in, or a BN pleco or something like.  Love to hear some feedback.

[FrozenFins]

Silvertip Tetras are fin nippers, so nothing with long fins. Some Celestrial Pearl Danios would be nice, with a gourami as a feature fish.

[David W]

Corys are almost always a good choice. Lots of fun to watch and they will be at a different level.
 

Just be careful over stocking can get pretty easy in a 20 long with multiple types of schooling fish. 

[aquachris]

Yeah.. thats the only thing I worry about is the size... there are more of these than I thought lol.  I do have a 29 gallon I could pop in eventually.. might do somethign with that to give me more height for the different levels of the tank.

Any thoughts on snails?