I believe a fish 12 inches and over with a tank large enough to hold them would be considered ]V[ONSTER..The old double nickel 55 i have is just not Monsterous to me. My 8 to 10 inch JD and GT hammered the sides all day, there just not wide enough for larger fish. I love the pictures and DIY here, but i went to Aquarium Central to fit my tank needs. My tank is the size of the filters here. My aquarium is small but soon growing and i know right where to go when i get there !!