i just got a 140g 4.5'L x 2'W x 2'T i have two AC110's on it. currently i have my four 6-7inch red bellys in it how many more can i have i wanted to add atleast 6 more maybe 8 for a total of 12.
yeah dimensions matter more than volume(although with these messy fish than volume does play a large factor aswell) In my opinion if the tank is 6 feet or longer you can over stock a bit (2 -3, maybe 4 more p's than the gallonage should usualy hold) but shorter than 6 feet about 1 per 20 gallons is a good estimate