I bought two shipments from SWF.com last December and when I got them there was ZERO die off. Everything was healthy and after accumilation everybody was zipping across the tank. Very impressive. The only thing I have a problem with is that I am a high schooler and I can only purchase things that will be delivered when I'm on break because when ever I want top have it delivered on saturday that option is never avaliable so I'm not spending too much money here. And buying $79 is a lot for one purchase when you're on a tight budget.