I have a 4-5inch oranda that is constantly swimming upside down. I have researched the problem and the best answer i can get off the internet is that it has a swim bladder problem that might be diet related. I feed my orandas "hikari" brand food. This oranda is in a 90 gallon tank along with 5 other similar sized orandas/ryukins. The suggested solution to this problem i read is to seperate the oranda and feed it cooked peas or any other soft foods. Is this what you guys or gals think i should do. I really appreciate any input from you experts. Thanks a million