I bought a freshwater moray eel about a month ago and he was doing fine at first. I know he's been eating bc fish kept disappearing as well as the ghost shrimp. Now he's been laying on his side breathing and doesn't really move. I even touched him gently to see what he'd do and he just sat there like he was sick. He looks fine, just past 2 days been laying on his side. I feel horrible that he's sick and have no IDEA what to do or where to start. I have noticed weird algae growing (rust color and bright green like a green highlighter on my river rocks too) and I don't know if that's it or not. I have the water brackish between fresh/salt currently. What do I need to do? I can't find anything!!! THANKS FOR LOOKING!!!!