This may be a helpful link for you,

Identifying Common Plant Pests

I feel like your gnat like bugs are white flies and I believe your yellow sticky strips should help with that. However, if you see anything on your plants and you're not flowering yet, spray them down and give them a good wipe with some diluted dish soap and a paper towel. That's what we do at my work. Either that or isopropyl alcohol. They both work great for dissolving bugs and their eggs! I hope nothing is nesting in your soil...that would SUCK!

Hope this helps,

SMG