Have you tested your tap water to be sure you dont have ammonia coming out of tap?
There is ammonia readings on my tap water, even priming it still puts my tank in cycle mode all over again.
Have you tested your tap water to be sure you dont have ammonia coming out of tap?
Perhaps your filtration isn't enough to carry the amount of fish waste. What type of canister and media are you using? If you clean the canister make sure you use tank water and not water from your tap. Also, you can dose a higher rate of prime to help with the ammonia. But, seems like it's gone down (per your readings). Just keep doing daily w/c and get some salt on the way home. Adding salt and raising the temp may ease the stress on your ray. Her being a bit more active is good news, so keep doing what you're doing and I'm sure she'll come around.
^^^ plus if the tank is continuously cycling the constant water changes can just keep this happening. Try backing of on water changes a little. How long has it been since refusing food? I have seen rays go 4-5 weeks without feeding but not all can. More active is a good thing........
Sorry to hear of your loss! Why do you age you water? Your ph out of tap and aged are there same. I dont see any problems with going straight tap as long as you dechlor as your filling.