How to Stop Fish Attacking Other Fish

How to try and calm down a dominant fish to stop it harassing other fish.

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[josie-]

Omfg this video really just saved my fish’s life

[leilan]

I have a smaller tank and I fixed the problem in about 15 minutes LOL. I took the back of my net (handle) and every time my powder blue gourami chased my other dwarf gourami, I got right in between him and told him who's boss. It worked like a charm. (No fish were harmed, I just got in between and made the powder blue boy back up away into my version of a time out corner). My neon dwarf gourami is thriving and they're best buddies again! YAY!
edit* Returning one of my babies is not an option for me, I love them too much. Plus, they were getting along great until earlier tonight.

[guineapiggamer]

I have a super mean balloon mollie… while I watched this he was up to his tank glass like shaking his head😂

[ALLIN-ntmn]

If u can make my parrots stop fighting man u deserve an oscar..they are one of a kind

[TrenBullone]

My tip is that you return the aggresive fish into the store and buy the victim new friends like him. It really worked for me!

[TsukiCove]

love the video man keep it up, I'm having problems with red eye puffers i'm creating hiding holes and different territories i'l see how it goes

[__CJ__]

Some say to separate in an entirely different tank and for 2 weeks. Also completely change your tank decorations before adding back in.

[Dovietail]

I've done this for 40 years, and it almost invariably works. The few times it hasn't worked, it's because the species was just in tirely too aggressive for the new species. In other words, if it doesn't work, it's the Aquarist's fault for miscalculating. That being said, green Severum are truly butts on occasion! He may need a few days in the Oscar tank! If you don't have an Oscar tank, get one. You need it to use as a threat!

[stephentang]

Like your post. You kinda look like a real humble and honest fish keeper.

[Elizabethperez___]

Thank you, I am currently trying to separate the agresive one for a couple of days. Hoping for better results.

[BlatentlyFakeName]

I'm getting aggression from a female pearl gourami who has started chasing my rasboras and corys. Weirdly she doesn't do it so much when I'm near the tank, only when I move away.

[AlcmeneUndertaker]

Update: Guppies are doing better, all females are in, and I got a larger tank. I now have 16, as one of my mollies gave birth, made a purchase of two tetras, one pepper Cory cat, and three Platies, and another Molly. The time out for the Guppy worked.

[Abeer_shahid]

my fishes are fighting, this will definitely help

[AnandKumar-pckv]

I have a baby red parrot fish, he always attack’s my baby oscars and rips his fins off😰😢

[morenoerik]

I have a naughty goldfish. We got it when it was a bit over an inch long. Kept him in a one gallon fishbowl till it was about three inches. It's now in a 55 gallon aquarium with other fish his size and he constantly sucks on them and chases them around. We have quarantined him multiple times but it doesn't seem to work. Gonna have to do something about it.

[fossphur]

I have an extremely murderous penguin tetra (all information I found said they were peaceful!) who has killed something like 9 of his fellow tetras, and 2 otocinclus, by biting their fins and tails off. I tried everything - bigger tank, more plants, rearranged plants to break up sight lines, floating plants, and eventually got some active yoyo loaches to catch the tetras attention and stop him from picking on his own school so much. Eventually with a 4 foot tank, 6 yoyos and a school size whittled down to only 7 tetra, the murders have finally stopped. I'm glad it all settled down because I didn't want to get rid of this fish, he was a rescue from someone's filthy dirty turtle tank and had been intended as turtle food so I've always wanted to give him a better life than that. I know I can't have any other fish that live at the top level of the tank, that have a dark lateral stripe (like the otos) or are torpedo shaped (like a zebra danio) because that is when the worst trouble starts.

[ThePOSM]

Eh, it works on some fish; but some fish, like people, are too set in their ways 😂

[Onion_Knights]

My goldfish did the same, and i found my culprit. It was the splashing(is that wat i should call it?) sound of water going into my tank from a tube about 4 to 5 inches above the tank water surface. It got so aggresive, it chase any fish in sight. And my other fish develop fin rot. Remove the tube, no more sound and the goldfish calms down. No aggresion after that

Today, i switched one of my powerhead down (the one that pump air bubbles), after some while, all three of my goldfish started acting differently. I put my hand on top of the tank, look like i am gonna feed them. Surprisingly, they didnt come for food, instead, 3 of them would move around very quickly (add some aggresion into it), bumping into things. Put the powerhead back on, everything went back to normal.

Its very interesting to see them react to changes

[bloxanaterlegostopmotion]

Omg that video made me cry. (When you brought the fish back. )

[GuiltyPleasures]

Just went thru this with a red spotted gold severum that was dominating the tank and making everyone stressed. Tried all the tricks.. added more coverage, switched the decor around and finally removed him to a small tank by himself for about a week. It all failed and I had to rehome him.