Snails and crabs

Kenmx10

New member
Came home and all my snails and crabs were hiding in the rocks. They havent moved all day. Checked Mag. at 1380, PH 8.0, dkh-8. I did a 20% water change. Any ideas why they are hiding. Cleaner shrimp, soft corals and fish all fine . Water temp-78.

Also there was a Bright flourescent orange powdery algae growing on my power head. I didnt make any connection though. But it is the first time i've ever seen it.
 
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