first off a 30 gal for a queen conch is to small. i have mine in a 180 and its about 5" now, bangguy has one about 10" i beleive, they get to big for a small tank. your tank could be to young to support the queen or a fighting conch at this point, do have diatoms or algae growth on the sand bed? they basically forage the sandbed for food. i live in warren not to far from rochesterhills.