I keep guppies with my breeding wild-caught A. cacatuoides OBs (that's another story) and Anomalochromis sp. Guinea. They make a good dither since they don't usually swim in the lower levels of the tank. I've had my strain of guppy for over 5 years and they're adapted to my tap water (pH 7.2, dGH 1º, dKH <2º). I definitely wouldn't go out and buy some of the Asian bred fish. These are bred in 50/50 salt water and will have a difficult time adjusting to soft water conditions. I wouldn't use guppies in blackwater tanks. Try killies. Mike Wise morten wrote: > i have some apisto. is it ok to have guppy in same tank? > > -------------------------------------------------------------------------