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Anonymous
if it were his swim bladder, he would look like he swallowed a ballon and have a difficult time controlling his swim pattern. he is old, he could be winding down. just keep his water clean, and if he starts having problems swimming then lower his water level and/or add broad-leafed silk plants for him to rest on. they'll make it easier for him to reach the surface
OR
he could be depressed and might like a neighbor fishy
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