i had my crocea clams on very top b4 while i am using 20 k 400 watts mh i think it love it but now the i switch to 10 k and more sps later its on the sandy bottom and loving it
all my clams are on the sand bed. ive put them in the rockwork, but they never seem happy. i beleive theres too much flow on the rocks. they seem happy enough on the sand though.
I tried to get mine to stick to a piece of liverock so i could place him higher and he has mover himself completely off the rock onto the sand so i just left him there - he's happy