First let me say you have a super well thought out grow room ..... growing hydro I’m glad it works but if you have soil neem works, period, when used right ....
Gnats are most often associated with overwatering and diatomaceous earth may help, may not, may miss them, like a mine field ....
Wikipedia info was limited so I challenge anyone interested to research:
Suzanne Wainwright-Evans .....
She would care to differ .....
28 year Cannabis Pest Consultant .... UoF Degree, Smithsonian Institute Speaker, just a few accolades .....
Search Web:
Suzanne Wainwright-Evans
Study - Listen to Podcasts - Lots of Free Info
Challenge me to do same, show me published supporting evidence Pro Grower uses Dunks, mind is open but it needs evidence, preferably with a .edu extension.
Peace