Hey guys, I'm new to this so please bear with me. About 2 months ago I started a saltwater tank. The first fish we purchased was a porcupine puffer. She was doing great, we fed her live crayfish, crabs and occassionally we ventured into feeder minnows. Well, we figured she was doing so well we would add another fish, a dragon wrasse. She did fine the first few days and now she is all over the tank, bumping into rocks, breathing heavily and her color is definitely off. We fed her some minnows the day before and we noticed that all of the minnows had died in the tank we were holding them in. We don't know what to do and we don't want to lose our puffer, any suggestions??