If the eel was feeding then I would check your nitrate as I suspect this could be an issue to rule out. Use a new test kit and not dip strips.
If any fish ever looks sick then test the water straight away no matter how busy you are and then do a 50% water change.
I have a lot of experience with spiny eels and they do tend to die in 100 to 200 ppm nitrate if exposed for long periods.
If any fish ever looks sick then test the water straight away no matter how busy you are and then do a 50% water change.
I have a lot of experience with spiny eels and they do tend to die in 100 to 200 ppm nitrate if exposed for long periods.
no I haven't checked parameters yet. I've been busy today. I did a water change like a week ago tho. I guess he wasn't stung tho because there is no mucous missing off the rays stingers. His belly was pretty bloated too before he died.