HCA: Hermit Crab Association

Hi I've recently discovered moths. I have 4 crabs molting. Moths aren't out of hand yet. I removed everything on the surface baked boiled and cleaned it.
I removed top layer of substrate. Didn't see any signs for almost 3 days ..then bam saw 2 on the camera again.
Should I dig everyone up for a full substrate change? Or can I wait? Please help. Thanks

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Adding that I have a 90 gallon. So it's no easy task. It took me dang near all day to do a partial and clean everything. I just want what's best for my babies.

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What kind of moths are they? They may not be harmful and you may not need to do a full clean out. Can you post a photo?