Hi all, I’m looking into starting a pond for a year round fish pond it can get into single digits where I live. I am thinking I will want a pump for water flow and aeration in the winter when ice may cover. Is there anything I should know about this that may be an issue? I was also curious how necessary a heater will be to keep the fish alive/ reduce the amount of ice that may form. I am planning on stocking white clouds, rainbow shiners, or rice fish as of right now.