ok this idea sounds like a good one... but i dont see how it will be enjoyable for you...
see ny gets snow loooooots of snow and your gonna have to cover it to stop the snow sooo your not gonna be able to see them 3 to 5 months out of the year.
then feeding them would also be difficult because opening the "pond" in the winter will drop the temp and not being able to watch/see them you know till its too late to see if there doing ok , if theres a light to even see them
to me it seem like a huge waste of time and money