what's in the main tank, fish-wise...... I agree with hurricane, make sure you are absolutely sure what you are getting is indeed a dwarf and not the clawed frog, otherwise you could end up supporting the frog in your 55 asking what could be housed with him. An easy way to spot the difference is the Clawed (which you don't want) does not have hhis front feet webbed, they only have their back feet webbed, but the dwarves do, all 4 are webbed on the dwarves.