Thanks to the help of Oliver, Apollo and many others here, I have an ibc based AP cycling with 20 feeder goldfish. pH at 8.2 in 150 gal FT & 75 ga GB which floods & drains every 14 minutes. The fish have been here 24 hrs, no measuable amm, nitrite or nitrate yet. Water temp 74 due to 2 350 watt heaters (still some snow on the ground).

Tanks are double layer bubble wrapped inside the cages and 1" exterior foam boarded outside the cages. Cramped space in front of car in an unheated garage forced a mylar floor to ceiling curtain. To make it possible to get to the back of the system, I put the whole thing on sandwiched osb to 1" with 12 270 pound rated non-rotating casters under it. This big skateboard was a 'perfect' design that rolled fine until the water went in. Maybe when the family shows for Easter dinner, we can get it used to moving again.

Once I learn how to post pics, I will