Lepperchan - Sorry I didn't catch this B4 last reply. Check your water for the essentials - pH, nitrates, nitrites, ammonia, temperature. Certain temps. will slow them down. Don't overfeed, and you might need to give them more AIR. I don't know why people still think goldfish don't need airstones, but the more you have, the more air they need. Try this and see what happens. OK?

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55 gal. tank-3 Koi, 3 Shubunkin, Black Moor, 2 Goldfish, 1 Calico Telescope, 2 Sarassa Comets, 1 strange Fantail.