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Jazander 06-16-2011 10:05 PM

psyco mollie attacking my other fish!
hi again,

I recently had my male molly die for unexplained reasons. I noticed then that one of my heavily pragnant mollies was being overly aggresive. She is orange. She has been attacking my other females. I have 2 others. I placed her in the livebearers net I had the frys but took the frys out. She was in there for about 2 days. She didnt give birth and I thought she would be okay so I put her back in the tent with my other female mollies. She instantly started attacking my other orange female. Violently. I dont just mean chasing her around. So I put her back in the livebearers net. Help please! Is this odd behaviour? I seriously think she killed the male. She is a psyco killer... Is there anything I can do?:|

Beaches 06-17-2011 02:40 AM

I have found that Mollies can be a naturally aggressive fish, particularly in more confined tanks, a 10 gallon doesn't really give them much space to stay out of each others way (if need be), a 20 gall. would be the minimum I would keep Mollies in. I noticed too, when I kept them, as well as other livebearers, that the females aggression would increase when pregnant and be more intolerant of her tankmates, they usually have an increase in appetite too, so it may be a survival instinct as well, in trying to lessen the competition for food etc. by keeping them away from her territory.

Now that the male has gone she is probably showing more dominance than before. I would put his death down to going through the cycling process more than anything else, but the added stress from harassment definitely wouldn't have helped matters. This is just a guess, but if it is only the other orange Molly she is focusing on, it could be a colour thing and another fish of the same colour is perceived as a threat perhaps.

I'm not sure what you can do in a small tank to avoid aggression other than isolating her, but keeping them in a breeders net for too long can stress them out a lot, a QT would be a better. Adding more Mollies to even out any aggression isn't an option for your size tank. You could try a divider in the tank to keep her isolated, but I think the tank is a bit small for that. Sometimes rearranging the decor helps or add taller plants (fake ones are fine) to help keep them out of each others line of sight. Maybe feed more to lessen hunger, but you want to avoid overfeeding them though. Providing more space would be the best way to help the situation.

fryup 06-24-2011 04:21 PM

I have to agree with everything in the last post :):):)
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britnyjackson 06-24-2011 04:43 PM

I agree as well. Well put!

LasColinasCichlids 06-24-2011 05:31 PM

I will also add, that if she is a balloon molly, they can be abnormally aggressive. As they are a hybrid molly and the ballooning is a deformation. Of all the mollies I ever had, the only ones that had aggression issues were the balloons, their lifespan is also much shorter than that of a regular molly, including lyretails.

Jazander 06-24-2011 08:25 PM

Ya, she is my only molly left now. She only attacks my male guppy now.

LasColinasCichlids 06-24-2011 08:51 PM

Well, as you may or may not know, guppies and mollies can crossbreed, and she is possibly fighting off the advances of the male guppy. Sometimes some fish are just better solo.

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