Oh -- it's only one tank? Then I for sure would be looking to bioload as a possible cause. The oldest tank is the 155g? I'm afraid I don't remember ... but don't you have more SPS in there now? If so you may have your culprit. Those stoneys will pull alk out of the water like it's nobody's business -- even a few little frags sometimes is all it's takes and suddenly you'll notice your coraline disappearing.
Them fuzzy sticks I tell ya ... much trouble they can cause! (um ... I'm not sure why I slipped into Yoda tongue there .. whups..)
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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