ACF acting weird.. any suggestions?

[MatthewM1]

Maybe some shed skin stuck in or around its mouth?

Is it stationary while doing it or swimming around? maybe it's just scavenging around for food if it's swimming?

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[mpmistr]

He's stationary. I know it's hard to describe, it's not the normal scavenging behavior. He's up against the glass on his hind legs or laying on his belly waving his arms and putting his arms in his mouth like he has something stuck in his mouth. It looks exactly like when they bite at duckweed and then realize it's not food and try to spit it out, except whatever it is, he can't get it out.

The odd part is he was doing this yesterday for 15 minutes or so then stopped. I fed him some reptomin, he acts perfectly fine and then this morning I checked him before leaving for work and he's doing it again. I was hoping he would stop before I left for work but I had to leave..

I'm totally confused as to what is up.

My best guesses are..
-A small piece of driftwood came off the decor and he ate it.
or
-A bug got into the aquarium and he ate it and it was toxic (I did find a black/red flying bug in my OTHER tank), but this tank has a glass lid (other tank doesnt) and very little way of anything foreign gaining entry..