Keep the temp around 78-80. A ray that size will eat one to two full size huge night crawlers per day and be happy. Be patient and slow down, stop making changes to your tank!!!!! Take one worm and chop it into super small peices. I mean really small like 1/8inch long peices. Im sorry to say but your making so many changes your making it hard on the ray. Make sure the water is clean and good and keep it steady, dont be adjusting the temp a bunch. Daily chop up one worm and sit at the tank and watch the ray to see if it eats. Dont try anything else just stick with worms right now. Your just making it harder on the ray, get one food it eats and start at that then you can introduce other stuff for it to learn to eat as food.
I'm not sure but how much is a ray of about 5 inch diameter suppose to eat? I'm not sure if it's starving or not... It tried to eat the red wiggles. I did cut it. But it just spat them out.... I turned up the temperature and removed the uneaten krill. I would prefer not to use black worms anymore as my last batch I had for a different tank had leeches in the mix.
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