Aggressive Fish

[mostlycichlids]

let out some of the water into a bucket try to use a net and and a plastic container. Try to encourage him in to the container with the net then put the net over the container and remove it from the water or use two nets just be careful.

 

[DaisyTattoo]

Is he a rainbow shark? If so you should only have 1 per tank. They will always do this to any fish that are similar in shape such as other rainbows, red tailed black sharks, flying foxes, ect. I tried to keep 2 as well and they did not do well. They get worse as they mature. I would recommend rehoming 2 of them and the third will probably not cause you any problems.

 

[plah831]

I interpreted that it was a rainbow fish, Melanotaenia (the ones Roan is fond of). If so, I think they need larger schools, like at least 6, otherwise their behavior is not normal. I've noticed this with white cloud minnows and danios, that even if there are 3 or 4, one of them ends up being a bully toward the others.

 

[fishn10s]

Is he a rainbow shark? If so you should only have 1 per tank. They will always do this to any fish that are similar in shape such as other rainbows, red tailed black sharks, flying foxes, ect. I tried to keep 2 as well and they did not do well. They get worse as they mature. I would recommend rehoming 2 of them and the third will probably not cause you any problems.

Sorry, I am new to fresh water fish keeping and don't know the names well. The culprit is a Boemamani Rainbow and the fish he is bothering are neon rainbows. It seems to me the literature is not saying they are very compatible. My plan is to remove and return it and get a couple more neon rainbows. I purchased the fish from what I thought was a knowlegable fish store. They have been around a long time and and the store and displays are really nice and clean. I have since lost confidence in them because of this advice they gave and also more regarding Bio Spira. I asked if it was important to refrigerate as I wasn't going home right away and he said of course. He said that it is only refrigerated to extend its shelf life. I have since researched and found out if it is not refrigerated, the bacteria will die! I'll need to work on finding a nice dependable store with accurate information.