Orandas & Moors are sub-tropical, so temp in the mid 70's suit them just fine.
They can stand much higher temps if the aeration is good. <My tank gets up to 80 in summer.> Warmer water can carry much less O2
than cool, and goldfish do get into trouble in warm water if there is not enough aeration.
At temps around 70, fancy goldfish start to slow down. Many gets into gut problems at lower temp (60's). <Their gut is squished due to the shape, and low temp = low gut motility, so they get constipated.> Get colder than 60, and the fish will prepare to hibernate for the winter!