I have a 2nd tank I'm toying with now. It's got 7 zebra danios and 3 african dwarf frogs. I had one senegal bichir in it but he died, every bicher i get ends up dieing when they go into the tank i dunno what the issue is. in any case... what's a good oddbal that would be compatible with what's in the tank now? It's a 29 gallon with a heater and stays at about 75 degrees. Thanks!