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Discussion Starter · #1 ·
I currently have a 36 gallon bow-front tank with 12 fish (2 denison barbs, 2 red-wag platies, 2 dwarf gourami, 4 mollies, 1 baby mollie, and 1 pleco). The issue that I seem to be having is that I have a male black mollie that is aggressive (chasing around the tank) against the male silver mollie and the recently added baby mollie. Also, he keeps mating with the yellow lyre tail mollie. I have tried to place him in a breeder tank for 12 hours to see if this would help calm him down, but it does the exact opposite. When I let him out he keeps mating with the yellow mollie. I know that mollies are very reproductively active fish, but this seems over the top as my Dalmatian mollie has not stopped birthing fry and the yellow mollie seems to be pregnant now too.

My question for you all is whether this is necessarily a bad thing or not? He is nipping at the other fish, just chasing them if they are close to him.
 

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Discussion Starter · #5 ·
Awesome information, thank you both! Right now the other male (silver mollie) has not tried to mate with the other two females. He is smaller then the rest of the mollies and that's why I think the dominant male is always chasing the silver male.
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