Hello people, I have been a member here MF for a few years but always in the SW section. I have kept snall Rays like Blue Spotted, Yellow and California Rounds for 3 years now but the latter is all I have now. I was thinking and infact planning to shut my system completely so my wife and I could be freed up to travel alittle more with no more begging the children to come over and feed the rays but those plans have changed some. I have been thinking of trying a few freshwater rays of some sort but am concerned of the huge water changes i believe have to be done. I have a 9' round pond/pool that i made a few years ago with my grandson, it has a 300 gallon sump and a big skimmer right now that can be sold if i do the switch, the total system is around 1k gallons of water with the sump actually having 100 gallons in the bottom. I am on well water which hasnt effected any of my marine life over the last 7 years that i know of. I dont run heaters with the California Rounds since they can handle temps from the mid 50's to the mid 70's. The water now is 72 but can drop into the mid 60's if we have a could winter. How much water changing will be needed, what temps, what about well water? I will not do rodi water again, way to much going to waste and too much work for the well pump. Sorry about a long post, thanks for the replies in advance.