Generally, I've always heard of koi/goldfish as fairly peaceful fish, but I do believe there are a few who have become bullies in our pond. I'm worried about one goldfish we have in there. We inherited him from a neighbor, he's a...I don't know what kind, I'll try to get a picture, but it is dark outside, so I guess that means using flash. I'll go take a picture when I post this message anyway.
Til then: he's a fat goldfish with a really long tail, like the butterfly koi. He's got a koi pattern too, white, grey, and black.
The koi seem to push him around and not let him get food, and he's not so good of a swimmer. He seems to get some food for sure, he certainly isn't wasting away, though I am still concerned. Has anyone ever had koi that act mean like this to other types of fish? It seems to mostly be our largest koi who is the trouble one. He chases and seems to nip at the goldfish. None of the koi nip or chase each other though. Just the poor fattie.
Right now we are moving, so they haven't been moved into a permanent pond. We have a big man made tub(no idea how many gallons... A LOT. I could stack my 55 gallon in there several times to give a good idea. 200g? More maybe?), but since they are growing I know it's not going to be big enough permanently. It's honestly getting close to being really cramped since they've grown so much this summer/fall.
Do you think he should be separated permanently? Could the aggression be linked to the smaller size of the 'pond', and having more space to spread out and hide could make it easier? I'm not used to the way these fancies swim, so I don't know how well they manage being in super big/deep ponds when it comes to dealing with these other faster fish and trying to get food.
I'm going to go ahead and guess that people are going to say I should separate him since there are already issues. As soon as I get a picture I want to ask--how big of a tank should I have for him? I'm not sure on the exact type he is, so that's why I'll take the picture and ask. It's going to be difficult convincing my parents to take him out, as that will just 'make things more difficult'. But if it's one of the goldfish that just need a 20 gallon, I could probably convince her much easier. If he needs a 55 gallon, I know Nathan's dad is REALLY into fish, and we have a spare 55 that he could go in. Though I don't know how much I want that to happen, I've sort of gotten attached to him, and his dad thinks of fish as ornamental. He seems to take good care of him, but if this guy shows any issues, I wouldn't be surprised if he was just tossed out and replaced. I could talk to him about that, and have Nathan watch and be sure he's fine.