07-02-2013, 11:34 PM
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Welcome! I am not an expert, but I am learning a lot and this website is very helpful to me. I don't know about it being a parasite, but I am just very careful with advice from pet shop workers. I have 2 dalmation mollies and a lyre tail molly in my 55g and they are very peaceful fish. I know that males will chase females and I have heard that in several fish species the more fish the better because they usually spread the aggression around so it may help to have your babies in the mix. It is also helpful to have more females than males. Every time we add new fish the older ones chase a bit to assert their dominance in the tank. How long ago did you add the dalmations?
Some chasing is normal, my black skirts chase each other all the time and their territory in the tank is very clear. I just watch for nipping and stress and make sure they are still eating. I try not to stress too much when my fish chase, like my local pet store owner said, "sometimes when we live with people all the time we fight too." But if you are concerned it may be more than just normal chasing. Luckily we have several tanks we can move fish around in if they don't get along. We had to move our lyre tail actually because our orange platy was chasing and stressing it out. More hiding places may help, perhaps some floating plants for them maybe?