By the sound of it, you had just put the ray in the tank? How did you accumate your ray? IMO it looks like your PH is vastly different then the tank that the ray came from.
Sorry for ur loss but with ur ray losing its protective slime to this extent, definitely something's wrong abt ur water. One night to cause this, did u even climatize the poor fellow properly?
I would advise u to read up & understand more on ray keeping before getting another new ray.
Yea.... I agree with the above... We need to know HONESTLY when you got the ray, acclimating procedure, how long the tank has been setup, what filters etc. bc rays put out ALOT more waste than you might think... sorry for your loss tho buddy
I agree with the others that with excessive sliming it could indicate something in the water. Try putting a few ghost shrimp in the tank and make sure they establish and survive. Shrimp and invertebrates are usually more sensitive to chemicals. If you have any issues keeping inverts than forget about rays.
Test the ph, even if above 7 now it could have dipped. Try testing ph And the hardness of the water. If harder this should buffer against ph crashes. If low the. This could indicate a shifting ph.
I would try and test for copper too as I thought "heavy metal", have you done water changes and added hot water as copper could have come from an old heating system?
Chuck a load of food in and monitor ammonia ova few days.
How long ago was the last water change and how old is the tank?
I've had the ray for over a week. I drip acclimated it, and did not just "throw the ray" into the tank. The tanks been established for over 6 months and i have a 40g wet/dry for filtration. The only chemicals i use are amquel and aquarium salt. I've done plenty of reading up on rays. My Ph is at 7.2-7.6 and my last water change was about 5 days ago.