I have a small 2 inch golen brown derasa that sits on the bottom of my sugar size sandbed. The clam does really well in medium current as it get fed dt's twice a week(which is a must as I have only NO lighting) My tank is long and shallow, however I have been told that it would have a really hard time surviving without dt's. As for attatchment-my clam is 3 months old and has not attatched to anything. If I have to replace it in it's sand divot I can clearly see that it will attatch it's mucus strings to small sand particles-but no serious footing here! And yes once in a while my clam does get knocked over by a silly snail or a creepy star, however it will usually upright itself in a day or two-if not I will simply use a long plastic rod to help it up in place, so I don't have to place my hands in the fish bowl all the time. Happy Reefing
