03-17-2011, 08:40 AM
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No, you can't fit any goldfish in a 10g on a permanent basis. It will work as a quarantine or hospital tank but I would suggest that for a fancy goldfish (oranda, lionhead, ryukin, fantail, ranchu, telescopes, celestials, frogheads, etc), a 20g should be absolute minimum for one. Siamese dolls will fit 15g bare minimum. If you want to keep two fancies together, then a 30g is bare minimum.
Lionheads tend to bulk up rather than grow slender but in rare cases, they can indeed achieve 10 inches of length with a bulk of 5-6 inches. 6-8 inches is average for them. Still too big for a 10g.