75 Gallon Tank Male Mollies suddenly fighting

Randomfishlover

I have had a group of four male molly (no females) for about 10 weeks now with no problems. Just this morning they started to become aggressive and began to fight each other.
I have placed one of them (the maon aggressor) into a makeshift breeding box in hopes he will calm down and I can put him back later. His fins are a bit torn up now and I don't want them to get worse.
Why would they suddenly do this? How can I stop it? Is this Common?
 

Ghelfaire

Yeah, mollies can be aggressive jerks. If you rearrange the tank it should mess up their territories and they'll have to establish new ones, might help.
 

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