I have 2 small issues going on with my plants. 1 is fungus gnats and the other is plants showing signs of overwatering. The gnats are a result of the overwatered wet soil and once I figure out how to decrease the amount of water getting into my soil, both problems should be solved. I've read about adding sand and or rocks to the top of the soil but wasn't sure. Any tips on limiting the amount of water entering my soil without messing with my misting system? Thanks in advance!