If it were my clowns, I would call that stressed...mine rarely go near the sand, but do the occasional wiggle towards eachother. I was told once that maybe the twitching is bc they have larval amphipods on them or something, and are trying to shake them off?
But those are just my clowns...and like everyone has said, they tend to be weird!
But those are just my clowns...and like everyone has said, they tend to be weird!