Hi
I have had my damsel for about 6 years. I recently added 2 new crabs to the tank after quarantining them (did not dump in the old water with them.) I also had to switch to a new salt : From Instant Ocean to Coralife because of a shortage due to the pandemic.
My Damsel now regularly gets a chickpea sized bump on its side. It explodes after about 4 days, leaving an eyeball sized hole in its side. The fish is behaving and eating fine otherwise. The Maroon clown in the same tank is totally fine.
Any thoughts on what this is and how to treat it?
I have had my damsel for about 6 years. I recently added 2 new crabs to the tank after quarantining them (did not dump in the old water with them.) I also had to switch to a new salt : From Instant Ocean to Coralife because of a shortage due to the pandemic.
My Damsel now regularly gets a chickpea sized bump on its side. It explodes after about 4 days, leaving an eyeball sized hole in its side. The fish is behaving and eating fine otherwise. The Maroon clown in the same tank is totally fine.
Any thoughts on what this is and how to treat it?