GL with what you do, and I just had to point this out. It seems that both replies are pointing to the fact that a 55 is too small. I think that KYOCEAN knows that. He is simply stating that he has a 55 already, but needs to know what size of a tank he will need for a stingray. I too agree that BlueSpotted Stingrays are too fragile for captivity, and that the Yellows are much better. I wasn't trying to start trouble, I just had to point out that KYOCEAN already knew a 55 was too small, and was asking what wasn't too small.