okay...this might work...my bird had "mush moths"...they are carried in seed/nut or the baby bird dried hand feeding "mush". the eggs are ingested, and basically when your bird craps, little moths can fly out....LOTS OF THEM. what works for them is putting out glasses of red wine in the area. they go for that in a big way. it could work for gnats, right? i'm not sure what they eat, but wine drowns the moths....worth a shot.