some basics about Black Moors:
1 ) Black Moors are classified as "fancy goldfish"
2 ) fancy goldfish:
---have been specially bred for hundreds of years to produce certain characterisitics
---typically have unusual body features, such as extra long fins or bulgy eyes
---typically only grow to about 8 inches in length
3 ) fancy goldfish should not be kept with common goldfish because fancies:
---typically don't swim as well as common goldfish can swim
---won't grow nearly as large as common goldfish
---are likely to be nipped by common goldfish
---cannot compete for food with common goldfish
---are not as cold-resistant as common goldfish
4 ) because of their breeding, fancy goldfish should be kept in:
--- water that will never drop much below 40F
--- water that will never rise much above 75F
--- at least ten gallons of space per fancy goldfish
--- groups (goldfish are very sociable)
5 ) kept properly, a fancy goldfish should:
--- be a very active swimmer in the middle of the tank
--- grow to an adult size quickly
--- live for 15 years or longer
--- always be interested in food (but that doesn't mean it always needs to eat!

)
your black moors would be perfectly happy if they lived in a 20g filtered tank kept at room temperature. that would be much better for them than putting them outdoors with commons.