Beneficial / Predatory Nematodes for Root Aphids?

Can I add Beneficial / Predatory Nematodes directly to my 20 gal DWC reservoir to tackle Root Aphids? I seem to have bugs that are below water...I think they're said Root Aphids.

I've heard such great things about the Beneficial / Predatory Nematodes.

My plan is to spray the Beneficial / Predatory Nematodes onto all plant surfaces, medium, sub-roots/medium, and then finally in the reservoir to circulate. I just don't know if it makes sense to circulate Beneficial / Predatory Nematodes.


This is part 3 of 3 of my pronged attempt to rid myself of these buggers. Step 1 was Zero Tolerance and step 2 was Azamax.