Greenbuzzliquids Solocup W/ Mars Hydro

Wow solo cup growing is hard. I'm out of grow liquid fertilizer and I'm having a significant fungus gnats struggle. So my leaves are doomed to fail at the moment. The yellow low leaves is due to nitrogen, but that unusual brownish almost eaten away sort of look....Fungus Gnats! I can only say this....my struggles with various things have definitely made it easy to diagnose my plants for specific problems. Fixing the problem is a little harder. Tried some hydrogen peroxide water mixture which is supposed to kill the larvae....but if you can't catch the flying adults then the cycle repeats. The fight continues.