yeah id agree @ least until they are older just becase its easier to see whats going on with them in a tank and be able to see stingrays bellies.. i love stingrays bellies
and a you can view from the top of a tank if you want.Ponds are amazing when you ray is pushing adulthood and needs the room.
Some day when I grow up to be a "baller" and have enough money to buy/build a tank that is TRULEY large enough for rays then I'll be able to happily view them in a tank.
Till then I'm stuck with what is best for the animal..... A pond.