I was concerned reguarding maybe a possibility with a lionfish sting- the pineapple trigger I lost was really messing with him- bit off a few of his fins but acted fine up until yesterday (he past away today )... was concerned that maybe clown had gotten to close & got stung and caused him to pass- lion is acting great. Fins are growing back no concern..Sorry for your trigger loss & ailment with your humu humu, could be water quality or disease issue, maybe @Humblefish & @4FordFamily can help. Another possibility could be your lionfish, what kind of lion do you have? I know some species of lions can & will sting other fish if they get too close to them(protection), having been stung by them myself, I know some of the tissue around the puncture can become necrotic. Maybe that’s what happened to your clown trigger, you mentioned a brown splotch on his side. Some survive lion stings, some don’t. By the way, how’s your lion doing?
wasn’t sure if a lion sting would kill them / unsure if they ever got stung but it is for sure a possibility... my huma huma trigger acting great he always swims back and fourth in front of tank still acting like himself (He’s the first fish I’ve ever put in the tank) eating like a pig.. I really don’t want to lose anymore fish!