ok i have a shubunkin, a comet goldfish, a panda catfish, and an algae eater in my tank. I do 75% weekly water changes and i do not overfeed my fish. the shubunkin has been acting strangely ever since i put the algae eater in 2 days ago. he looks thinner than usual and is acting slow and sluggish. he sometimes rests on the bottom. the comet and the other 2 are doing fine. i am very worried about my fish. please help!
he is getting enough food but he isn't eating it