I was speaking with Shed and he led me to a post from
@Carcass regarding the use of the BT bits. Maybe it will help.
This is how Carcass describes it:
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I just throw 1/4 of a dunk in the 5 gallon bucket every 3 weeks or so to keep the gnats away...
If I have an active gnat infestation, I'll use half a dunk in the bucket for a little more killing power, then
I go back to 1/4 of a dunk to keep the grow space gnat-free...
A quarter of a dunk is equal to 1 tbsp. of the bits, if you decide to do it this way.
The reason I do it this way is that it takes 24 hours for the bacteria from the dunks to populate the water, and I don't want to have to fill a gallon jug 24 hours in advance of when I water the plant, so I just treat 5 gallons at a time, and the water is always ready to use..
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Food for thought. If you don't see any improvement with the change in nutes by the weekend then you may want to consider starting over.