Hi, all. I'm in Zone 6b, and this will be my first winter with my stock tank water garden. Things have really gone well, all summer long, and I want to make sure that I transition into cold weather the right way. My tank is a galvanized metal stock tank, about 300 gallons. I've got lots of filtration--maybe more than necessary, and about 9 fish (comets/shubunkin), unless there are fry that I haven't found yet. At this point, I'm just starting to make my shopping list for things that I'll need. 1. Net to keep fall leaves out. 2. Air stone/oxygenator. 3. Heating element. 4. Bales of hay to insulate the tank from Anything else that I should put on my shopping list? Also, if people have recommendations for the size, types or brands of air stones and heaters I should be looking for, I'd be grateful for the advice.