ricordia Fl. question

[dangeroo]

I have 3 ricordias. Recently, my middle sized one has been "coning up" I'm sorry i sound so vague but it looks like the speaker from an old phonograph......but only one is doing this, the others seem normal. any help appreciated, thanks

 

[currentking]

normally they are eating when they do this, it is normal. some of mine do it all the time

 

[Bud's Reef]

I've had the same experience as currentking plus they will do that at night a lot once the lights go out in the tank.

 

[dangeroo]

thanks for the replies! You put me at ease!