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He's the only catfish in the tank so he's pretty much left alone. He's the biggest guy in the tank so no one goes near him. Looks like it burst again during the night but the fish seems unaffected by it. It also looks a bit cleaner and better today. He definitely needs to go on a diet though...

I did initially think it was some sort of parasite myself but surely something else in the tank would be starting to show signs of it too?? Having been watching it over the last 48 hours or so it does seem to be more like a cist. I thought a cist was a bit harder than this appears to be however...

Just to add....none of the other fish in the tank are showing any signs of disease or injury.

Hi Colin, The "bubble" burst as the catfish swam out from his hiding place and grazed off the log that is in the center of the tank. It happened so quickly and I didn't notice anything come out of the bubble when it burst. Looking at the catfish now, he's behaving normally (as in he's hiding...

Irish originally :)

IRLChe Living in Spain and have been a hobbyist now for 4 or 5 years. Main Tank: 250L Fresh Water Communal Tank: Cory's, Plecos, Xray Tetras, Clown Loaches, Angel Fish and a Raphael Catfish. Secondary Tank: 60L Fresh Water Molly's, Cory's and a juvenile Pleco.

I woke this morning to see a white bubble/blister had appeared between the dorsal fin and body of my catfish. Not sure how long it's been there or if it's just appeared. I generally check the tank everyday just to do a head count and make sure there is nothing wrong but the catfish is generally...