I have a Red Texas/Red Dragon flowerhorn cross and he has stopped eating completely for the last week or so. I normally feed him Spectrum pellets. I've done a water change, and tried different foods (live feeders, tubifex). He has no interest in anything. I assumed he was constipated. I dropped a couple peas in the tank and he had no interest in those, and yes I took off the skin on the peas. I'm really not sure what else to try. Is there any medications that I can add to the tank? And if so, would I need to have a quarantine tank or would I put able to just medicate him in my 55 gallon? He's the only fish in the tank. Any advice would be really appreciated. Thank you.