Anyone have an idea what may have happened? I have 3 clown loaches. Just noticed them picking at the ray. Other then that I do have two 300w uncovered heater one each corner of the tank
You can't have an exposed heater in the tank. To be honest it looks pretty bad and I hope your ray survives. You gotta keep doing 30-40% water changes everyday for a few weeks. Dont add any kind of chemicals to the water. Hopefully it will heal on it's own.
Really sorry to hear that man. Rays are tricky, and many of us have lost our first ray unfortunately. Here's some lessons I've learned that have helped me become a successful ray keeper:
1) best to buy rays from a reputable breeder/dealer until you've gained some experience. Trying to rescue or nurse an unhealthy ray back is not for the beginner
2) no exposed heaters
3) no tank mates. Too many problems!
4) be sure that your filters are fully cycled to handle the HUGE bioload a ray puts on a system, rays produce 10 times the ammonia that a normal fish the same size produce. A small ammonia spike is detrimental to a rays health.
5) don't give up if you lose your first ray. It's unfortunate...it really really sucks, but learn from it and try again when your ready. Ray keeping is a rewarding, life changing experience, and well worth the trouble. In my opinion rays are the ultimate fish!