That was slightly confusing...but to me it sounds like that Pumpkin is a female and the fish are chasing her because she could have eggs in her...or they could be just choosing to pick on him/her now. I know once and awhile my fish would pretty much pick a fish to chase and play with and then would do it for a long time and then the next day would pick another fish to bother.
Pumpkin, and Sarasa sound like both females, and Happy Kisses sounds like he might be the male of the bunch. Don't know for sure, maybe someone else can help ya..as long as they aren't hurting Pumpkin, I wouldn't worry about it.
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