Hi

We are very inexperienced fish keepers; have 2 small coldwater goldfish-type (though not actual goldfish as they do not grow big; sorry I can't remember exactly what they are called). Anyway, they belong to our 9 year old daughter, who is away at grandparents this week. They live in nice big tank and are fed regularly, though as they are in her room we haven't been looking at them much except to feed them. Anyway, we noticed today that one of them is looking very weak and doesn't seem to be feeding. We have tried giving extra food but the other one just eats it. We thought about taking the weak one out of the tank (with tank water) and putting it somewhere smaller so it can get to food more easily without competition, but we are worried the move might traumatise it to the point of death. But if we move out the fat one, I'm not sure the thin one has the strength to make it to the surface to feed. Daughter is back tomorrow - we'd prefer her not to come back to dead fish if possible... any suggestions?

Thanks and best regards,
Sarah