I can't get my sunfish so I'm going to breed bettas in my 40 gallon breeder. Eventually they will go to their own 10 gallon and I will do something else with the 40 but this is the plan for now. I have some platy in there but they are hanging at the surface and I think the oxygen is too low. I'm going to add the biowheel filter back on but it's only sized for a 20 gallon and will be at one end of the tank so the bettas have a no surface flow area to breed. There is a small internal filter on that end. I plan to plant it but for now it just has some periwinkle (vinca minor) experiment. Eventually I'll have the money for an order off azgardens. I'm wondering what would work better in the tank than livebearers? What fish survive low oxygen and flow environments without bothering the bettas too much. Or other critters too? Will gladly take free applesnails to try out. I worry a little the bettas might pick on them too much. Especially the male when he's guarding a nest. I can move them if it doesn't work out.