I recently got a pair of kribensis and have them in a 29 gallon tank with 6 tetra (3 rummy nose and 3 black/gold). They have been in the tank 3 days now, the female is always approaching the male curving and shaking her body towards the male. The first day he pretty much ignored her but the last 2 days he's become more aggressive towards her-- nipping at her fins and belly. I have notice some pieces of her tail missing but it's not terrible. Sometimes she will try and hide from him, but either he will find her or she will go and try shaking in front of him again. Then it starts over with him chasing and nipping at her. He is larger than her-- approximately 2 inches while she is 1.5. What should I do? They have many hiding places and caves, a couple java fern plants, tank has been cycled, nitrates 20, nitrites 0, ph is around 8.4 which I know is high but it comes out of the tap like that. It was the same at the fish store. Filter is penn plax cascade 700 which seachem matrix & chemipure. Oh, and the male does calm down a bit when I turn the tank lights off and allows the female to sift through the sand near him, but will still nip and chase her sometimes. She just keeps trying to shimmy and shake and it's not working. Should I take her out and try another female? Opposite? Help.