I have had what i thought were a pair of Kribensis... they were 'shacking up' together in a little cave... another juvenile male/female hang out seperately on the other side of the tank. Well, the female juvie must be in heat. She has selected the much larger male, and has been making quite a display of her red belly, twisting her body and vibrating her tail as she chases him around the tank. The older female is NOT happy with this, nipping at her tail, and the larger male runs after her as if apologizing. It's like a soap opera in my tank... lol! Looks like there may be some babies soon... let's hope!