I got tired of buying unhealthy feeders for my needle nose gar and balloon green terrors. I went out to the stream next to my house and caught some little minnows that looked like large feeder guppies. I kept them in a quarentine tank for about 2 weeks. I used basic parasite and disease treatments. I then transferred them into my live bearer tank for keeping. Within 2 days everything, even the snails, were dead. What could have happened?