This has been going on for a couple of months, but other than sitting - on an ornament, on a plant, or on the bottom, one of my blue gouramis just sits most of the time. I put him in quarantine for a month and he swam a bit more, but didn't appear sick so I put him back in general population. He goes to the top for air and food, swims a bit now and then, but otherwise just sits. The others do not molest him and no one else is acting strangely. Any idea what's up?
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Gouramis are prone to a wasting disease that is not well understood. It could be that, or old age, or any number of things that we cannot see. There probably isn't much you can do that wouldn't just be guessing that could be more harmful than letting him live his life. I'd check ammonia, nitrite, nitrate, and temperature just to rule them out too.