Why is my Dalmation Molly fish so aggressive? Is it the tank or the fish itself?

cfd

New member
Jul 22, 2008
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I have a 5 gallon Hex.... 3 female mollies (1 silver, 1 black, 1 dalmation), 1 male molly (silver) and 2 african dwarf frogs.

The dalmation molly was the latest addition to the tank. She now seems to rule the tank with authority! She constantly chases them. She doesn't nip them, but she will chase them even if they look at her the wrong way!

What gives?! Is this fish dysfunctional, or is the tank simply overcrowded? These mollies are not big. Probably 1.5" each.

BTW, the females are not pregnant at the moment. The black molly just had fry about 10 days ago, they are in a separate tank.
Correction: The fish are more like 2" each.
 
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