Greenhouse: 6-week update on my experimental insulation project, 1 by Gypsi

Gypsi wrote:
Current events: I will run some hot water into the tank with the tilapia tomorrow afternoon when the temp starts dropping, and I will plug their heater back in. Got some expanded shale in trays, need to get some biological filter in that water but for now fish seem to be unhappy but ok. they are not eating, seeing a trace of nitrite, but a couple of weeks of crowding no filtration will do that. They are alive