1st Grow, -Gnats, products recommended?

I noticed yesterday 1 or two little black fly gnats flying round my grow room. I killed them and continued to check the top soil. a found 2 more. after evaluating the room today I saw 1 in the soil.

Really need some recommendations as to pest control, Nursery or homedepot products. I read that gnats can lay larvae that can kill my girls! Really being cautious here tho, female WW and they're only 2 weeks old. (GROWING STRONG THOUGH!)

Heard of the jar of vinegar thing, but what if the bastards already layed eggs?!

Ppl have also recommended removing the top 3 inches of soil and replacing with peat moss or sand. (Wont sand cause fleas?)

Any advice is really golden @ this point. I'm not going to wait till my room is swarming before I get control of this problem. Really need some efective tx to take care of this ASAP!
 
use perlite to cover your soil. theres neem oil and gognats that you can soil drench, sticky fly traps work good and you can cover your soil with a cube cap or makeshift device to stop light from hitting your soil
 
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