Brad!

[Aquattro]

Tony, no heat spikes in my tank whatsoever. The people I've talked to only after having introduced a new clam, all around the same time. Have you been following the thread on RC about this? Symptoms are identical. A poster named Reefdream has (so far) successfully treated this problem with antibiotics.
From memory, all the people on this board reported problems after purchasing a new clam.