I have a full grown EBA male with possible internal parasites. He hasn't eaten for past 3 to 4 days and his belly appears sunken. His color is good, no clamped fins and he comes out a feeding time but has no interest in eating. He is presently only cichlid in 55 gallon planted tank with school of Columbian tetras and Corydoras. I do 25 % water changes weekly. No ammonia nor nitrite and nitrates stay around 20 ppm or less. Temp 76 to 78 ° F, pH is 6.6 - 6.8, gH is 8°. Good filtration and flow (306 Fluval canister with spray bar and a back up sponge filter rated for 125 gallons). Normally I feed him Cobalt cichlid flakes (he won't eat pellets) and frozen cichlid cubes and frozen blood worms. As a treat freeze dried brine shrimp cubes that I rehydrate in tank water. This morning he came out then went back behind a piece of driftwood (his cave). When I first got him as a 3 inch juvie, 8 months ago, he was skinny and spitting out food. I treated him with Metroplex mixed with food. He responded after about a week. I would go that route again, but he's not accepting food. It was suggested by another fish keeper that he may have hex and to try metro with Furan 2 as General Cure is a rather mild antI wormer. I'm setting up a 19 gallon tote as a hospital tank (my quarantine/hospital tank has new fish in it undergoing quarantine. Just waiting on a heater I ordered on line and waiting to see how he responds to 2nd dose of General Cure. He is my favorite fish and I would hate to lose him. Any suggestions would be appreciated.