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Stappercrab

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My understanding of ORP is a bit weak. However, as I understand it, ORP should be fairly stable in a "good" tank. Everytime I clean my skimmer (thereby drastically increasing foam output) my ORP rises instantly (goes from 350 to 440). It stays there for a few days, then returns back to 350 where it stays put for 1-2 weeks (at which time I clean my skimmer).

I'm having troubles with Starburst and Leather Corals. All other are OK.

Could this be related to the ORP fluctation?
Is the fluctation normal? Important? Sign of something wrong?

Thanks in advance for the input.
 

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