So ive seen this before but it doesn't happen too often and anything i looked up seems to say it could be possible breeding. I have 2 sens together one is female and one male. Sometimes they will follow each other and push and nip at each other. I haven't yet seen either of the sens nip at the delhezi, bowfin, ornate, or guinea. So since its just between the male and female sen could it be breeding? or something bad? I can separate them if i have to but they tend to like to lay with each other so id hate to do that.