thats exactly what it is. I use ffof for bloom only and even then its too much for some. happy frog or light warrior are good starter soils for veg. just let it dry, and run a bunch of water through, thoroughly flushing it and you should be fine.
i just pulled a crapton and think that 10 per is fair. or even 12 for a bill. or 25 for 2 bills. i like those prices, and i didnt even use a ezcloner, though they are nice.:-P
Im just usin aerated tap water. The first one is planted in just happy frog soil, the second in happy frog and coco coir that had soaked in a small amount of humic acid for 20 minutes, and the third had probably a 50/50 mix of coco coir and happy frog. The humic drench one was prolly a 25/75 mix...
i use aerated water, but my tap comes out at 300 ppm and is aerated after that point in a large reservoir for at least a day before use. I actually was just experimenting with coco myself. heres my results if you dont mind my interjection.
yeah its basically just the trichomes that fall off the plant. those are the crystals you see all close up in pics. just a bunch of them pressed together.
heres a link to help with identification. its a pdf, and you want the second page. the first page is helpful too, but has nothin to do with insects.
http://www.horticulturesource.com/pdfs/quick-reference-conversions.pdf
and as far as fungus gnats go, i use dont bug me spray, yellow sticky...