Did a full clean and re-aquascape of the tank today, so I thought I'd take the opportunity to measure the altums. The three year old altums measured 5 inches body height with a total height of 10 inches, and the two year old altums measured a body height of 4 inches, total height 8 to 9 inches.
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These are a couple of the three year olds.
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Thirty-five years keeping and breeding discus, and I'm still learning :P