I had gnat problem in my Utrics and I just used a knife and made some scrapings of mosquito dunks. All you need is a' starter' culture of B. thuringensis. If there's food, in this case gnat larvae, they'll multiply. You don't need a whole lot.
If it is any help, I keep mosquito dunks in my rain barrel and the water from there hasn't harmed any of my plants (that I can see). I've never used it on pings but i have used physan on neps and dews without problems.
It's a tough life being a Sarracenia farmer
My Grow List http://www.terraforums.com/forums/sh...d.php?t=123776
man, since joining the forum, i had no idea that there are so many potential problems with CP, good luck to you.
Mosquito dunks are FINE. I've been using them few a number of years now.
Twitter : Tommytimbertoes
"My best advice to anyone who wants to raise a happy, mentally healthy child is: Keep him or her as far away from a church as you can." - Frank Zappa
Mosquito dunks kill gnats, too? Wow, lots I didn't know. I though t it would *only* kill it's target-- baby skeeters.
If you shake a rain stick, you get rain. I need a hamata stick.