Good luck, topz! I will keep a close eye on your efforts Thanks for sharing. I am just getting into AP and for now am going the more traditional ibc route to see if I can do this. I am using unheated garage space for now, with HID and in tank heaters. I am in SE Mich under weather limitations but am excited at my chances. Once I get the hang of it, I will follow your lead and expand with the hot tub housed in a new sunroom.

At least the fish will use the thing as we have stopped and it seems a good idea.