Originally Posted by MIKE22cha
Hey man get off his back. I take it this was probably his first fish and he didn't know a lot of saltwater before. he like so many others, probably rushed into things, and learned their leason and became a wise aquarist from it. Freshwater puffers I heard going into saltwater tanks also. Who doesn't want a puffer, huh?
Coral Keeper apparently knows the difference between freshwater and saltwater. There shouldn't be a lot of learning beyond that as far as what fish can be kept in what. The reason I'm belaboring the point is because Coral Keeper has a history of putting odd things taken from the (non tropical) ocean in his cube and then wonders why every once in a while something goes wrong.
I should add that this is the first I've heard of the guppy since paying attention to Coral Keeper's tank. I'm guessing it's a new addition, not a first fish.