There is certainly a lot going on in the tank ATM so ya, it will be challenging to pin point the exact cause. Certainly bioPellets could be the culprit as well. At this point it wouldn't really harm anything if you took the pellets offline if you wanted to. Get everything else in check first and then bring them back on line. And yes you will be resetting your seed time for the pellets.
In the end it's probably a series of things going on making the corals unhappy.
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