Awesome. Now that's a all u can eat tilapia/worm buffet for themhow big are those monsters?
Great setup John.
All the rays look quality fish, especially taken by the Mantilla hybrid, she is a very attractive ray.
Regarding the Clown knives(Chitala chitala) are they peaceful with the rays? I have always admired this species and have kept plenty many years ago but found them a little unpredictable with other fish, however many fish with this type of disposition are ok with stingrays......any problems at all??....judging by the condition of your rays I would suspect they have been ok.