This was a first. I hope they were just playing. Hillie kept landing on plec; plec didn't hurry to get away. Pec would just wiggle around, but the whole time they stayed in a small area of the tank. I suppose hillie could have been just asserting dominance, too. I don't think they would ever hurt each other, do you?

Not really sure what to tell you. It could be innocent or it could be eating slimecoat of the other fish. I would keep a close eye on them just in case. Have you been noticing this behavior still, since this post?

No; haven't seen it again.

Probably just harmless then.

Thanks!