Question about bicolor angel

[Garyf7257]

so i purchased a bi color over a month ago and I had him in QTfor 30 days just as a precaution. Never saw any signs of disease during that 30 days. I did give him a FW dip with no signs of flukes. Yesterday I added him to my 55g and the only other fish is a maroon clown. The maroon would bite him every so often but the tension has worn down. I've noticed him twitch his head and also I have a pederson cleaner shrimp and he's constantly trying to get cleaned. I know normally that is a sign of a external parasite. He doesn't seem stressed. He swims around and follows the maroon around. He's very hardy and loves to eat anything I put in the tank. I just don't get it. He was QT for 30 days and now that i added him to a bigger tank he's twitching and wanting to get cleaned. Any suggestions is appreciated. Thank you.

 

[Maritimer]

I'm sure there're a dozen things it _could_ be, but not sure which ones it's _likely_ to be. @melypr1985 or @Humblefish might see something in your description that didn't jump out at me.

~Bruce

 

[Humblefish]

If no flukes showed during the FW dip and velvet did not turn up during QT, then my best guess would be marine ich: https://www.reef2reef.com/threads/ich-cryptocaryon-irritans.191226/

Ich trophonts can remain confined to the gills, out of sight, if you are just passively observing in QT.

The only other thing I can think of is if possibly microbubbles in the water are irritating the gill plates and causing him to twitch. Or some other irritant is "messing" with his gills.

 

[melypr1985]

Was the 30 day Qt observation only? If so, then I agree with ich. It's so easy to overlook ich since you may not always see signs of it outwardly.