It would help us if you actually used the proper name of the species you are housing. I'm going to take a stab and guess that you have a firebelly toad. With that being the case there are no good tankmates for them. They do secrete a mild toxin that can be fatal to other small herps. Also amphibian species should never be mixed because of several key factors;

1.) Easily stressed
2.) Different habitat requirements
3.) Food competition
4.) Bullying
5.) Released toxins.

Long story short make it a species dedicated enclosure, it will be better for them.

http://www.youtube.com/watch?v=gzxz3GYH0kA
Eastern Newt?

you just asked that