flowers discs are thin very thin ,i think fishdog thinks maybe the sand is doing it to the disc.also fishdog i have had a henlei eat krill first? very starnge i know cause he wont even eat krill now,but all rays are different.
move that ray into the 110 alone no other fish at all so you know it eats.get black worms and any live stuff you can find,ghost shrimp might be to big! try snails, any type of worm too at bait shops,they sell small ones also.sometimes it takes those rays 30 plus minutes to get motivated to pounce on foods.this is why its so important its alone.put a worm right on the front of its disc and leave it sit in the dark for a bit.u can use tongs and hold it their too but if the ray gets spooked dont hold the tongs their just let the food go and watch,you will know what i mean
you need live black worms asap or live small worms
alot of responses on hear so quickly leads to panic in my experiences.take it easy that ray will do ok it did eat so chill out.it will again.