Reddish-brown mites, look kinda like spiders or ticks?

[kahuli]

I stupidly brought in some leaves from outside, washed them under the facet and then put them in my earwig and millipede containers. Then I got these mites which seem to have spread to some of my snail tanks. I haven't found many in my snail tanks but it concerns me and I'm not sure what to do. It wouldn't be easy to take out the snails/baby snails/eggs, slugs/baby slugs/eggs, and all sizes of roly polies and woodlice so that I could remove the substrate. Would it be worth doing that if there's only a very small amount of these mites?

[Firoz Taverbi]

Hi Kahuli, what size are the mites? I've found a couple of very small (less than 1mm) orange-brown mites on my snails - I don't know what they are though! I'd be really interested to see if anyone else has had these and know if they're worth blitzing the tank to get rid of...