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I introduced my black moor back in with my other goldfish yesterday after a month or so in quarantine for suspected fin rot. He seemed fine and so did the others until this afternoon. I noticed one of my other goldfish, my smallest one, has a tiny rip in the dorsal fin and 3 rips in the tail including one very long one. It looks nothing like fin rot and it happened over a few hours, so I'm sure it's torn fins instead. I've been watching him all evening, he's been mainly in the back corner of the tank . Then about an hour ago, I found that one of my other fish is chasing this small one, and one other. The other being chased now also has a rip in her tail, which has appeared within the last half hour. I've had this trouble before when I first bought this bullying fish about a year and a half ago. He started this not long after introducing him. He calmed down after a week but my fish were so tired after being chased. I'm assuming he's starting to get territorial since introducing the black moor back in. I don't know what to do because I really don't want to take him out because I've just drained my quarantine tank. But obviously I don't want my fish to get hurt either. Do you think it's best to leave them be? He doesn't do it constantly, and it's not concentrated on one fish, but is he going to cause any severe damage? He puts his nose under their tail and he pushes them so they swim like mad. He doesn't seem to be "nipping" though.
Video of behavior in question: We were finally able to upgrade to a 55 gallon tank and get solitary Leo (Male Oranda) a friend, Darla ( Unsexed Oranda). At first, it looked like a match made in heaven. Leo seemed so happy to have a fish companion and Darla seemed at the very least to be accepting of his affection - they schooled, and cuddled and he hardly left her side. However, A few weeks in to this made for TV romance things started to turn nasty - Darla went from docile and coy to aggressive and rude - Chasing Leo around the tank and nipping his fins. Leo seemed frightened and depressed - hiding much of the time at the bottom of the tank with his fins ripped and his dorsal fin down. We seperated them with a tank seperator and Leo perked up and was again swimming happily for a few days. Then Darla found her way around the tank divider. She is less consistantly agressive, but as the video shows she can be pretty ruthless and Leo seems quite overwhelmed by it. Darla is currently in time out in our 20 gallon QT tank. ADDITIONAL INFO: Leo is for sure a male (he has the mating tubricles on his pectoral fins) Darla does not show any male characteristics, but as you know, those don't always show. They are both Orandas. Leo is the bigger of the two about 4 inches head to tail, but Darla has been growing rapidly and is quickly catching up to him. They live in a 55 gallon tank so theoretically they should feel like they have enough room. QUESTION: So what is this behavior? Do females ever chase males? Is Darla a male trying to dominate Leo for territory incase a female should join them? Is Darla bullying for alpha status? Is this a fight over food and we should be feeding them more? (They get 10 Hikari Oranda pellets 2-3X/day each) OR is Darla finally showing her true colors as a consumate bully? Any help on what this behavior is and how to stop it would be much appreciated. Thanks, Sandra, Jesse, Leo and Darla
The fish I have in my 100litre tank: 1 x zebra danio (female) 1 x long finned danio (male) 1 x pearl danio (male) 1 x albino white cloud (male) 2 x white clouds (females) 1 x tele goldfish Nitrates- 5 Ammonia- 0 Nitrite- 0 pH- 7.8 WC yesterday (80%) My female zebra danio has started to behave like a little madam and aggressively chases the others. Littles fights and chases break out between everyone once in a while but this is becoming persistent and its always her now that seems to do the bullying. I've put some small dividers at the top which they can swim through, but I thought it would break up the chasing a little and give them a few more places to hide. It has helped but she is still targeting everyone (except my goldfish thank goodness). Is there anything I can do?