Are Some Goldfish Just Mean/disabled Goldfish Friends

I have a black moor, an oranda and 2 mystery snails that live together in a 55 gallon tank. I bought the oranda when someone told me that goldfish are social and for the first few months it worked out fine. My oranda was pretty aggressive but he didn't injure the black moor. Then about 2 months ago my black moor lost and eye (poor baby) mysteriously. I came home one day and the eye was nowhere to be found and I've tried to remove the tank divider since she's healed but the oranda is viciously attacking my disabled fish. Can they ever be reunited, or do I need to get a separate tank for my moor. Also is it possible my oranda is just mean or is there something wrong with food, water, stocking, etc that is making him so agressive. When he's on his own he terrorizes his snail . So I'm basically just wondering if I need to get another tank and adopt another sick fish to go with my moor and another aggressive fish for my oranda or do they not need pals?

My tank has been running for a year, I added the animals one at a time. The water parameters are 0ppm ammonia 0ppm nitrate 20ppm nitrite and the ph is 7.6. I do 80% water changes twice a week. I feed twice a day, once new life spectrum pellets, then repast soilent green. They also get veggies like blanched zucchinI or spinach twice a week.

I'm attaching pictures. Excuse the dirty tank in the black moor picture I took it to send to my vet after I went on a week long vacation to make sure she was still healing properly.



Also I know they aren't the cutest or the best I rescued them from petsmart and I love them

 

Very cute!

Some fish are just plain mean unfortunately

 

I have never had a mean goldfish in my life. Could the Oranda possibly be a male and the Moor be a female? If so, he may be chasing her and pushing her to get her to lay eggs. It can look pretty aggressive and my female comes out of it sometimes with scales missing. Your pic isn't too clear but a male will usually show breeding spots on their gill plates, front fins, and sometimes along the dorsal fin. What kind of subtrate do you have? I hate sand, personally but it could soften the blow if the Oranda pushes the Moor along the bottom. I've thought of changing mine for that very reason.

 

I have never had a mean goldfish in my life. Could the Oranda possibly be a male and the Moor be a female? If so, he may be chasing her and pushing her to get her to lay eggs. It can look pretty aggressive and my female comes out of it sometimes with scales missing. Your pic isn't too clear but a male will usually show breeding spots on their gill plates, front fins, and sometimes along the dorsal fin. What kind of subtrate do you have? I hate sand, personally but it could soften the blow if the Oranda pushes the Moor along the bottom. I've thought of changing mine for that very reason.

The oranda has breeding stars, so almost definitely a male. I don't know the sex of the moor. He used to chase the moor around and not seriously hurt it but since she lost the eye it's gotten a lot more aggressive and when I put then together for an hour she had ripped fins and such, which healed in qt

 

Poor baby. You may need to keep the oranda by himself. They are social fish but a lot of articles say they don't need a companion.

 

Poor baby. You may need to keep the oranda by himself. They are social fish but a lot of articles say they don't need a companion.

I've heard that animals will try to kill animals they think are diseased to keep themselves from getting the disease?

 

True. Some will abandon or attempt to kill an infured animal at times. Just makes me wonder if possibly the Oranda injured the eye in the first place. Who knows.

 

True. Some will abandon or attempt to kill an infured animal at times. Just makes me wonder if possibly the Oranda injured the eye in the first place. Who knows.

The fish vet I called is wonderful- myfishvet.com is her website and she said either that was the case, she was pushed into the filter intake, or she was blind in the first place and her body just dropped the eye. In any case the oranda did eat the eye because it was never found