wuestion about spider mites

i have 6 plants under a kw hps. 2 weeks and three days into flowering i noticed mites on the canopy of a couple of the plants. ive heard that a strong plant isnt susceptible to spider mites. i removed about three plants a few days earlier that were severely infestested(top nug shoots were completely webbed all the way around).the ones that i am speaking of have moderately spotted leaves but no serious webbing.i also have two lights in that room with a few plants and was wondering whether i should keep growing the six under the light or should i remove them in hopes that it will not infest the other plants? likw i said the mite infestation is just noticalbe when observed closely.can i just resume growing and see if the plants fight the mites?
experienced growers reply only.
thank you.

You need to get sumthing to kill those little suckers NOW.........there are plenty of products that will kill them dead yet still have a short withholding period and they wont hurt the smoke... not like the mites will....try your local hydro/garden supply shop and get sum poison that is suitable for vegetables....kill them