Okay, some history of the pond. I bought my house about a year and a half ago from a woman who was rarely around to care for it or the pond. She left it to her sons and visited every other weekend. The pond is a 2500 gallon pond with a waterfall (which we stopped running last year b/c of a leak d/t improper installation). We do have it set up so that water still runs into the pond as though the waterfall works. Since the pond was leaking when we first bought the home, water had to be put into the pond on a daily basis. The pond was very dirty. In this pond, there are Koi, shubunkins, comet, and what the woman told me were 2 albino catfish. She didn't go into further details about what kind of albino catfish they are so I really don't know. At the time, they looked quite good (color wise). Since we have gotten the pond, we have been working to clean it up, improve oxygenation with plants and improve water clarity. Since we stopped the waterfall, we no longer needed to add water on a daily basis. Beginning around June/July of last year the catfish began to develop dark red areas on their body. Not specific to one area, but all over. Around July 4th, they really looked bad...had trouble breathing, very sluggish, didn't eat, etc. However, they got over that in about a couple of days, but the color never went away. It did fade as we entered fall and winter and they looked a little better. However, as we are back in the full swing of summer, they are really starting to look very discolored again. They are behaving fine. No symptoms other than their discoloration. We don't have very much shade on the pond for the fish as our lily pads are not very big- they need a little work done with them. I'm just wondering if they could be getting sunburned as this problem never occurred until the pond clarity began to improve. We have noticed some of the other fish are having some other problems, but they don't seem to be connected. Right now I really want to concentrate on the albino catfish. Pond water tests fine without any problem areas. We are desperately seeking help as we are not that knowledgeable about fish diseases and would like to keep them all healthy. Any advice is greatly appreciated!!!!!!