I know, it sounded weird to me at first, but even a good change - say, lowering nitrates/phosphates - if done too drastically can effect your corals. LPS can recede and lose color, etc. Any major swing in parameters can negatively livestock, good or bad.
It's like when we come in from the cold to a mall and they have those heater fans blowing crazy hot air at the entrance. Of course, it's nice to get warm, but it's such a difference it can be hard to breathe and uncomfortable.
Also, a lot of guys reported problems - especially cyano. This happened usually when they would put a lot of pellets in from the beginning.
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