I would up the water changes to twice a week at 30%. And you could try getting her to eat small pieces of market shrimp. That's what my rays mostly eat. If you stick to night crawlers she may get addicted to them and not want to eat anything else.
i will leave food in the take for a few hrs .. if its not gone in a few hrs i take it out .. that has yet to happen .. one of my rays does not eat really fast .. she kind of takes her time .. eats a few .. swims around eats some more . she does that for a little while ..
Well I had to use some seachem to lower the ph and it has risen again. That tells me that the city must have something in the water that is buffering things. What do I do now?
what's the pH of the water right out of your tap? I know a lot of ray keepers on this forum keep their rays in varying pH, the main focus being stability of the water (i.e. keeping the pH stable). I wouldn't fool around with a lot of chemicals. Rays will adapt to many pH levels.
The water out of my tap is around 7.0. I don't do anything to it and my rays don't seem to mind. I'm sure others can chime in about what pH they keep their rays in.