i have a question about my new clown loaches , i recently bought 3 juvi clown loaches i ve had them about a week or so, i noticed them rolling around in the play sand that use. they look healthy and eat like lil pigs so im not worried about health. but this does look a lil unusual to me. this is the first time ive ever had clown loaches in a tank with sand. is this type of behavior normal, it really looks like there just playin.