Ryan,
Yes, I'm using the spa's heater which is very capable. As shown, I've augmented the spa filtration system with a pressurized bio/mechanical filter and have seeded it with beneficial bacteria already.
I really appreciate your info, Ryan, and the PM's especially. Gives me some confidence going down an unknown road. If I do half as well as you did, I'll be happy.
My "plan" this first time is to just have the breeder fish survive and gain some weight until the end of February and at that time crank up the temps, turn on the lights and try for spawning activity. Based on your results, I think I can handle 30 to 40 pounds of fish for a short time between March and April or May when they are released into the ponds. Really appreciate your comments.