Anybody know what’s going on with my Sailfin

[Black Clover]

Hi all.
Anybody know what going on with my sailfin?

He’s missing pieces of his fins and looks like a little more each day…

More info:
All fish just came out of 90 day (QT) quarantine for ich. Everything was great! DT Tank was fallow for this time. The sailfin started showing these symptoms a few days after being placed in DT. He eats nori and brine shrimp and otherwise seems fine.

Water parameters are good with nitrates a little elevated (nothing new).

Tank mates include 2 clowns, damsel, fire shrimp, cleaner shrimp, banded coral (boxer) shrimp, and many hermits.

I keep thinking the only one capable of snipping him is the boxer shrimp and this does not look like fin rot after looking at other pictures. I haven’t seen the boxer chase him but God knows what happens once the lights go out.

Thanks!

 

[PharmrJohn]

One thing you CAN do is find out what happens after lights go out! Fish are on their best behavior when we're watching (yes, it's a thing!). So set up your phone to video capture and let it run. In about 20 minutes without someone in the room, you may get a glimpse as to who's the culprit. I'm thinking it's the large clown (Maroon?)

 

[KrisReef]

The mouth shaped chunks missing from the fins are symptoms of a common infection of tank competition disease. Remove the clowns and see if the conditions of the tang improves.

 

[Black Clover]

Thanks!

Interesting cause 90 days together in QT and nothing… but the clowns did start nipping at my fingers in the end.

Clowns are Picasso and Darwin. No Maroons.

 

[WalkerLovesTheOcean]

Set up a camera. Put in some food and come back in half an hour. Check the footage. You should see who it is.

 

[PharmrJohn]

Thanks!

Interesting cause 90 days together in QT and nothing… but the clowns did start nipping at my fingers in the end.

Clowns are Picasso and Darwin. No Maroons.

And I fell for it again. Dark color and forced perspective. Gets me everytime!