If you had lots of air in the sump going through the water it would make it just fine up to the display tank. Water holds oxygen for a good while.
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Could it been a lack of oxygen I have a pondmaster air pump in the sump and did not have air running into actual tank? Sump was low full air tube was not submerged. Just added another pondmaster to add air directly into tank. Just racking my brain. Thank you all for your comments realy apprciated thanks
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