Good luck, you can order spider mite predators ( I have never used these but here they work) but whatever you do don't let it go. My very first indoor grow I had 5 plants flowering and got an infestation that I did nothing about, I thought they would finish fast enough, needless to say I only had 2 plants left at the end and the yields where no where near what they should have been. They devastated my crop!
Good Luck