One thing worries me here....I keep hearing the words puffer and triggerfish in the same sentence with ray.
With puffers, you'll probably be OK, as many of the Arothrodons don't like fish flesh BUT I've noticed they don't always seem to consider sharks and rays as fish(they'll eat raw shark, yet spit out raw bony fish flesh) PLUS you've got the problem of the tail.
If a puffer goes after that tail, which would certainly tempt many puffers, there'll be severe damage ASAP, and while not fatal, could lead to some serious infection problems.
With the small puffers known as Tobies, the odds of them biting and attacking the disc and tail both go UP 100% with an additional problem.
Most puffers and tobies sleep on the bottom or buried in the bottom, which is where stingrays hunt simply by trapping the prey animal under their disc and then "humping up" in the middle until it swims near the mouth, at which time the ray slams down and dinner begins.
If this happens, you have two dead fish.
Most puffers contain tetrodotoxin an EXTREMELY strong poison with no antidote..this is the famous Fugu gai Pan that people eat, playing "Russian Dinner".
If it's cleaned right, you have a delicious meal and you're way cool and macho.
If not, you're dead.
Same with a stingray.
As to Triggerfish, while the triggers are small, same problems as above, minus the poison.
When they get larger, the ray dies, one bite at a time.