Hi There, I have 3 of these little guys in my tank. I hardly see them except in the late evening and at feeding time. Here in the Uk we call them Cory doras or talking catfish. I love them 'cos they appear to have feline-like faces and are sooo pretty. They were about 1 inch long when I got them and now they are nearer 3 inches long. I Have 3 hollow rocks in my tank and they live in one each. One of them has a slightly deformed gill, and we call him 'funny gill' (yeh, ok) . When we did a partial water change recently the rocks were taken out for a short while, and you should have seen the guys panic!! Nowhere to hide, they swam about like mad things, trying to hide under other fish, and each other. I love them, they make me laff.