Conscientious Marine Aquarist by Bob Fenner (10)
Marine Fishes by Scott W. Michael (10 for fish, 0 for everything else, but duh, its called marine fishes)
My grandpa got me some little books but i could have written them. (2)
Also, Aquarium Fish or something like that is a big book. i got it when i was still into freshwater but there is a little bit in the back about saltwater. (4)
I have scoured Fenner's and Michael's books over and over, and reading on wetwebmedia, reefcentral, here, and other places on the internet. i have read so much about it that even though i just got into the hobby, i know a lot a lot about it. im young enough, too, that i can start now, and maybe become a marien biologist or ichtyologist.