Mine have been bbs-less for a day and a half now, my last 2 batches went down the crapper and I don't know why. But I noticed after I added more salt, I got a very low hatch rate but at least some hatched. Try leaving the light on them for awhile too.
As for your new spawn, just stay on top of them. How high is your air? I noticed with this spawn,that I had my air really low, I couldn't figure out why my bbs was dying within an hour of going in the tank. It finally dawned on me last night that I had too little aeration for so many fish. I've noticed a huge increase in activity since I up-ed it.
2 mw cultures died? No more vitamins in them then, that must be it.
As for your new spawn, just stay on top of them. How high is your air? I noticed with this spawn,that I had my air really low, I couldn't figure out why my bbs was dying within an hour of going in the tank. It finally dawned on me last night that I had too little aeration for so many fish. I've noticed a huge increase in activity since I up-ed it.
2 mw cultures died? No more vitamins in them then, that must be it.