What I'm about to write is from personal experiance- some people may not agree with me, but it's what I've been through myself:
I have two goldfish (one is a baby), and I personally feed them small amounts twice a day. As for tank size, you'll most likely EVENTUALLY need a larger tank if you see the fish getting bigger, but if you've got a baby goldfish or two in a 10g, I honestly don't see the problem. I've heard that they don't outgrow their enviornment (mine are in a 30g right now), but when I first got them, I had them in a 10g. The other fish I had them with grew larger, and so into the 30g they went.
As for feeding, you may also try offering them a wide variety of food. Flakes are fine, but mine tend to love Goldfish Crumbles (they also sink, which is good becaue goldfish like to dig around in the gravel). Even food made for koi and goldfish has worked for me- pretty much most pondfish food. If you go with some of that though, make sure it's small enough to fit in the fish's mouth- I've had more then one occasion when I've had to break food into smaller bits for my baby goldfish!
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