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I definitely agree. My oscars not only know when it's me, but my albino specifically likes my wife. They will all hide behind the rocks and sulk when any of my neighbors, or particularly neighbor kids, come to look at them. It took my red tail cat more than a week to be comfortable coming out of his cave when I was watching (I have a chair set about 5' away)...Initially I could only watch him from the staircase about 40' away.
They also know the difference between feeding and water changing time. When I feed them I just lift the front of the lid and when I do water changes I take the lid off. If I lift the lid they'll all rise to the surface and wait for their pellets/crickets/minnows and if I'm not fast enough with their food sometimes my fingers too!
As to sound, it's hard to say how well they can hear, but I like the analogy of someone talking to you while your head is under water in the tub. They definitely feel the reverberations and can distinguish different voices/sounds/patterns. When fishing as a kid in crystal clear Colorado rivers and ponds, we'd always low crawl to the edge of the water and be sure not to make a single sound - not only could the trout see you coming but they could hear your footsteps and voice as well!
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