You can see spider mites with the naked eye, but it's very hard. They don't run around fast. It sounds like you may have a chigger, they are a type of mite I don't know if they bother plants but they bite people.
How good is that ozone generator? That's the way I'd clean up my grow area between grows, it'll kill anything that you leave in there plants or whatever if it's strong enough. they do tend to break down certain plastics and might actually cause your tent to fail earlier but I kind of think that would be years down the line.
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