I hate this book and I wish I'd never downloaded it, really a 0 star. This talks about size and then tells u to go buy an aquarium and kill all ur fish. Then you wonder why. THEN YOU DISCOVER YOU PUT FRESHWATER GROUMIES IN YOUR SALT WATER AQUARIUM BECAUSE THIS BOOK TELLS YOU NOTHING ABOUT FISH, THEN YOU DISCOVER YOUR AMMONIAS TOO HIGH ANYWAYS, AND SO IS YOUR PH, AND SO IS YOUR NITRITES!!!! WHY?? BECAUSE THIS BOOK TELLS NOTHING ABOUT THIS. If you want an aquarium, go buy a cheap 10 gallon with a slow flowing filter, dechlorinate it, decorate it, cycle it, and have your beta fish live for 3 years. Or you could have a fish for 2 days if you trust this book, the choice is yours my friend, would you rather have 3 chocolate bars or 1 chocolate chip, would you rather have queso cheese dip, or eat your chips plain. DON'T EVEN TRUST THIS BOOK, you get the point