The types I have seen are micropeltes, bleheri, and gaucha.
The bleheri and gaucha are good candidates for smaller tanks. ie: 50 gal+ or so
The mircropeltes is one of those fish that should not be sold. Unless you have a tank of atleast 600gals for one fish do not bother.
Remember the reason why these fish are even being sold/mistreated is because people buy them.
I have heared of very few people that keep channa micropeltes for life.