Obviously they have been very well brought up and went to the very best tropical fish school. So they are well versed in recognising the signs that feeding time is approaching.

My goldfish always came to the top of the tank and put it's mouth out the water when he saw my hand coming towards the tank.

It's the same instinct that it's time for feed for fish that still live in the wild. And there are many feeding triggers. Fish in tanks just adapt to different signals that it's tiem to feed. That's all

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