you would have to be careful that anything of around an inch may seem a target to chase. i would say around the 2 inch mark to be safe and dont get common type goldfish, stick to the fancy types. for feeding its generally accepted what they can eat in two minutes without it reaching the floor. sut your fish look really healthy so you must be doing something right. feed them boiled, shelled, squashed peas once a week and some lightly boiled lettuce too.

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