My family found two goldfish in a lake swimming close to shore. We found this unusual and my kids caught them and we brought them home. The are about two inches long and keep very close to one another. My question is they didn''t eat any of the small pellet food we fed them. Do I keep trying or should I try flakes? The are swimming around and exploring, when should I worry? Any other hints would be greatly appreciated. We bought a 10 gallon tank with a filter for them to start out, does that sound ok??