When I had 2 they hid a lot, coming out to feed after we'd moved back away from the tank. I added 3 more and initially they all hid! Though their favourite hiding place must have been a bit of a squeeze! After a week or so, they all started coming out more! We then moved the whole tank inmates into a new corner tank and they are ALWAYS at the front watching us watching them (etc!!) so I would love to know what they can see! But other than sticking my head in, which I don't think they'll like much, I suppose I won't know!
Mine will take a little flake food, because that's what usually goes in 1st at feeding time, but they like to catch an algae wafer each, and munch it as they swim around (I buy King British or more recently hikari, which are 4mm discs) then whilst they're distracted, I put in some aquarian sinking pellets, which the corys like. But if they're not eaten when the dollars have finished their wafers, they'll also have a nibble of those. Once or twice a week, we give them some lettuce - little gem, grow your own mixed leaves or baby leaf spinach. Which we clip on a plastic clip which is tied to a small stone and piece of thread - so it will sink to the bottom and can then be retreived more easily.
