I have 4 large containers that are crawling with MILLIONS of microworms from my first little culture plus 2 large jars with vinegar worms, but I have had very little luck hatching brine shrimp. I have tried several times and my best bbs hatch rate would be less than 50%, with all dead within 24 hours. I have them in a soda bottle hatchery using salt, aeration and heat..no luck. My question is, will it make a big difference in the growth rate of my fry if they get the worms and crushed flakes and no bbs??? EDIT: Since I can't seem to hatch them, are frozen bbs acceptable?