I have a 20 gallon tank that currently has one 2 inch rainbow shark and 4 one inch tiger barbs in it. It has a dojo loach, but sadly, I found him belly up on the bottom the other day. Anywho, I was wondering what kind of fish I could get to round out the tank now that the space taken up by my loach is available. I don't want to get more tiger barbs, as even though I know they do best with 6 or more, the four that I have have been living with the RTS for months now, and all five of them get along great. any suggestions?