About a two weeks ago, my ranchu started sitting at the bottom of the tank. I've had him 3 years already and am rather attached to this chubby guy. I placed him in a floating basket and checked all my parameters. Everything checked out fine. Ammonia and nitrite 0. Nitrate at 20. I treated the tank with prazi in case it was worms with no luck. He still eats and poops black. He only moves when food is available. Today I pulled him out and checked him with a magnifying glass. No sores, anchor worms, or any indication of illness. I'm baffled.
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