Stop blaming yourself, it gets you nowhere. Your cray attacked the knife because he was dying, nothing more. Your redtail was probably on its way as well. That's what *many* fish do, not just crayfish. I know it's too late for the crayfish, but please keep that in mind if something like this happens. Ask yourself if the animal was behaving as it should, if it was, then you can't blame it.sloshy said:Well I'm pissed, but you reap what you sew. My ghost was in my crayfish's mouth when I got home, and upon a close exam. of my other fish I saw that the top dorsal fin on my red tail is missing. The only thing that could've done that was my cray. I got so mad I killed my cray which I paid 32.99 plus shipping from liveaquaria.com. My ghost cost 22, so together that's over 50. I will never own a cray again. I WILL NEVER GO WITHOUT A QUARANTINE TANK AGAIN! My tank has ick or I would have given the cray away. All this because of two $3 loaches. I also lost another neon tetra. I'm so let down -after all the money, time and effort I'm losing my breath. I will continue with the salt/high temp. for four more days. Thanks to everyone who answered.
As for the rest of this, it's not YOUR fault. There are NO warnings on the medications that you used and IMHO that's just not right.
All you can do is learn from this and move on. Cheap words, I know, but other than offering sympathy for the losses, there's nothing else I can do

Roan