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Old 02-22-2016, 07:59 PM   #1
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Molly aggression

So over the last week or so I've had 3 guppies die and when I checked them all their fins where almost completely gone so I've been keeping an eye on them and today I noticed my mollies going after one of the guppies. I can understand if it was male mollies and male guppies but all I have are females bar one Molly. I haven't had any issues until recently and the only thing that has changed was the addition of a flounder and a knight goby. I could see the mollies feeling threatened as knight gobies can be territorial but the goby swims with the mollies as if he's one of them and shows no aggression and the flounder is nocturnal


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Old 02-22-2016, 10:36 PM   #2
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What size tank ?

Mollies can be Semi-Aggressive and should be in at least a 30g.

Try feeding 2x daily. Mollies are super active and have high metabolisms.


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Old 02-22-2016, 10:45 PM   #3
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55g brackish with 5 mollies 5 bumblebee gobies a dragon goby knight goby and flounder/hogchoker


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Old 02-22-2016, 10:55 PM   #4
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Guppies aren't brackish AFAIK.
Hard water yes, salt...not as much as Mollies. Plus a Dragon Goby might eat them anyway.


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Old 02-22-2016, 11:03 PM   #5
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Guppies can live in brackish water they can't tolerate it as well as mollies but better than platters and swordtails the dragon doesn't eat other fish from what I've seen only the bumblebees and knight gobies do. Even when the mollies where attacking the guppy today they didn't have an intent to eat it from what I saw only injure it.


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Old 02-22-2016, 11:18 PM   #6
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Doesn't sound like a good environment for Guppies. I'd chalk it up to lesson learned and not add more Guppies to that tank.


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Old 02-23-2016, 12:37 AM   #7
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All the remaining unharmed guppies have been moved to a 25g with a gourami rasbora and a betta so they should be left alone there peacefully


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Old 02-23-2016, 02:11 PM   #8
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So far there's no aggression in the mollies from what I can tell. Could it have had something to do with the goby? It was all peaceful until he came but it's peaceful now without the guppies. And the goby hasn't showed any aggression towards any fish as of yet.


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Old 02-23-2016, 09:45 PM   #9
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Maybe it changed tank dynamics ?




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Old 02-24-2016, 03:41 PM   #10
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But it seems like the new fish have integrated into the other fish. The goby shoals with the mollies and the flounder/hogchoker seems to be nocturnal and only comes out late at night and early morning.


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