I have two tanks and I want to know the gallons of them. I'm pretty sure I know the gallons of one but not sure. The tank I have my fish in is 1 foot tall by a foot wide by 2 1/2 feet long. The tank I have my turtles in is 1 foot wide, 19 in tall and 2 1/2 feet long. I'm guessing the smaller one is a 20gal and the bigger is a 30gal? Can someone tell me the right gallons?