Hi ive just got the mite problem and im gonna use 'ORGANIC NEEM OIL' which can be used right up til 4th week of flower at least.

But if you are in the states get some 'NO PEST STRIPS' just hang in ya garage and it will kill EVERY insect,spider and mite in there (wish we could get them in the uk.
(I personally think you would be better with the strips than neem oil, until your clones are a few weeks old).

Good luck mate