Its really good to see what they have become despite a bit of a struggle at the start, theyre looking greaat! I use the yellow traps too, those gnats can be really annoying and they reproduce so quickly... sometimes I top with
diatomaceous earth and skyp the potassium silicate feeding since
diatomaceous earth is mostly silica. (Never had to use a tutor since I started using more silica, you can really tell the difference). Two more traps that I use sometimes when it gets nasty with warm humid weather is coffee with milk (yes, I serve them coffee) and suggar, I was getting a lot that way, or the classic water, vinegar, suggar and yeast. They fucking love coffee tho, I need to change it every 1-2 days because Im not stupid and I dont want mold but its really effective. If you put it there ice cold it will last for longer.