I ordered the smaller pots, because I am only going to have bean leaf neos. The smaller ones are 3" by 1.5" deep. I have the Kuroshinjyu in one of them. I have to find two more small neos. Senzai will be one of them. The next size is 3" by 2" deep. I have one larger one that is 3.5" by 4" deep. I have ended up getting 8 pots in the 12x12x18 tank.