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My question is, how do you know when a fish is getting old other than how long you’ve had it against life span. I’ve had my Yasha Goby for 2 years comming March. I know their expected span is 2-3 years (Hoping mine hits close to the 2.5 year mark if not longer) but are there any signs that show if a fish is old. I have noticed my yasha has a different pattern to what I remember when I got him but also I think he has black dots but I’m unsure.