Ok, for example the book says for a 75 gallon peaceful aquarium 2 Unarmed Perchlet, 2 Occellaris Clownfish, 3 Yellowstriped Cardinalfish, 1 Minda Blenny, and 1 longnose Butterfly. Or you could do this for a 75 peaceful 3 Yellowhead Jawfish, 2 Chalk Bass, 1 Blue Chromis, 1 Swissguard Basslet, and 2 Royal Gramma.