I've been in the hobby for 3 years now and it's the first time that I ever bought a stingray. I had my stingray for about 2 months and everything was fine. He was eating and always swimming around. 2 days ago I saw that the top of his skin was peeled off and he had red veins under his stomach. Also, I was cutting up pine wood in my basement and I may have got some particles in the water, is that harmful? He was just a baby and he was in my 125 gallon with an FX4 canister. Please help, I need some advice