Far from what the two other posted. They are just "flashing". If you got a itch, scratch it. Just like Datnoids. They will flash with out any thing wrong with them. Just keep on doing what you are doing and they will be fine.
Oops failure on my part. Didnt realize cichla did that too
Yeah, cichla does it a lot bro. Just as much as dats.
BUT, if there is redding in/around the gills, then that is something to worry about.