fruitfly help
i have bought from several sources and the fattest flies (hydei, dont bother with melongaster) are from scales-etc.com , they are easy to grow but by the time you get it all going you wont need flies any more , just for future reference,you can make your own medium for cheap enough to make dozens of cultures for $10 (harvey peterson mix) , deli cups, and aspen fiber, are readily available online. mites might be your problem, mites are everywhere and difficult to spot if you dont know to look for them ,and they love to attack ff cultures , to keep them under control keep your cultures under control, keep them on a coaster in the middle of a sheet of fly paper or self adhesive shelf paper sticky side up , just tape or pin the coners down . you can get 1000 pinheads for $20 on ebay (chirp-n-time cricket farm ) but you wont need pinheads for long, my jackson's are only 13 days old, and they out grew pinheads a week ago