Hermit crab question.

Liz

Ok so I’ve had two new crabs for around a month and a half now. I had to take one out because I was fixing up the tank with a new heat lamp. I saw something moving on his shell. It was this teeny tiny little bug. I looked it up and heard a lot about mites but the bug didn’t look like a mite from what I saw. Instead it looked super skinny and small. It was kind of tannish orange. Should I clean everything out, change substrate and give them a bath to make sure everything is cleaned out right?