just toss em, and clean you plants, just fucking trust me not worth the hassle of keeping them, stay away from your friends grow, straight up. take this shit serious as possible.
if you want to keep them move them to another area AWAY from your current babys and hit them hard with some spray of some sort and leave them there for 2 weeks till you know their cured.
this is from expererience. dont fuck with the spider mites, i went through hell with spidermites trying to collect rare strains, from local growers.