"This tank is great! There are many different sizes so it makes it great for any size of fish. The lids come in alot of different colors. I got the green lid and I love it. You can't beat the price. There is a little lid on the top of the lid (i know that's cinfusing) that you can open to feed your fish so you don't have to open the big lid everyday to feed them. I would highly reccomend these.
Large-about 3.5 or 4 gallons
Medium-about 2.5 gallons
Small-1.5 or 2 gallons
I am not sure the exact amounts for these but I know this is close to the real sizes."