For some background, I took in an RES from someone I used to work with because they are moving out of state. I am not sure how old Rocky is, but he is about 6-8 inches long. They had him for several years and he was only in a 20 gallon tank, with no basking light. He got pellets and 5 gold fish a week. Shortly after I got him, there was a tank sale at the pet store so I was able to move him to a 40 gallon. While I realize that he should have a bigger tank, it is what I can do for now. In summer he is going to have pool time in my grandsons old plastic pool. Anyway, he does some basking, he does some swimming and hunting around the floor of his tank (I think he is hunting for fish). However, he will also go down to one corner and basically hang out for days and then, like today and yesterday he swims back and forth in the front of his tank like he is trying to escape. It is pretty frantic looking sometimes. For the last two days however he has been so bad that he has basically destroyed his tank set up. Is this normal? We have only had him for a month or so, and I have been trying to improve his diet and his environment but I am worried by this behavior. He has duckweed to eat, I made jello shots from this website, and while they are still gold fish, I have set up a breeding tank with guppies using his old tank. No one around here sells red minnows or will sell anything but goldfish for feeders. I would post video of the behavior but don't know how. Any help is welcome, including how to post video. I wondered if this behavior might be because he is close to the tv and the noise may be bothering him, so I am planning to shift him to a different wall away from the tv. Thanks
