This is retarded! lol even if you could buy them it would be really cruel to keep one come on a whale it's certainly one of the dumbest things i've ever heard of kind of like the whole pigeon pyramid scam.
Oh well in that case that site needs to up their perfect tank size to at least a 75 gal. Because whales are air breathers, you don't have to have both ends in the tank at the same time.
Of course they are real... I've got 6 of them with 4 poo-eating cichlids in my 147.2 gallon tank- they love swiming between the rainforest vals and the endler grass.
They love to eat the snails when the snails are switching shells.