I kept the nematodes refridgerated
I applied them in the dark
I mixed the nematode mix with water to apply
I waited for about a week before I checked the fungus gnat situation again, this way the nematodes were not exposed to any more light than necessary. Unfortunately when I did check, the fungus gnat larvae were still present, however their population had declined.
I was wondering if anyone has any experience with fungus gnats in hydro systems, or with nematodes in hydro systems, and may have a solution for my problem or an idea of the effectiveness of nematodes as a biological control in hydro systems.