Lots of great advice, and information in this thread that stokes some good, and not so good memories.
I didn't ever get into the salt water, but went whole hog on the fresh water for several years. Had a vertical 80, and several 20s.
Was going to get rich selling angel fish to the aquarium shops!
They were charging a lot for them, so I took in a couple hundred of my nurtured pride and joy baby angels in to them. They offered me 15 cents each.
I kind of lost interest after that.