So I just ordered some amps, two to be exact, online. N. ampullaria Brunei Red x Harlequin and N. ampullaria Brunei speckled. I have a 10 gallon for them set up in my greenhouse with a lid that seals off the tank completely. I was curious about how I should go about doing this... I want to do something where it will retain enough heat in there at night to stay like 60F so the amps will still grow. The greenhouse should be kept at 50-55F at night during winter. It is about 50-60F at night during summer, in which my only other lowlander has done wonders, but is now slowing down as nighttime temperatures are staying at about 50F (no heater is being used right now).
So, the best way to do this would be water, right? Putting two inches of water in the bottom and sticking the pots in there would cause issues... In the day, the water would heat up to like 90F and boil the roots. At night, it would cool off and have no effect at all.
I had a five gallon tank of water out there with guppies in the spring and it didn't go below 60F usually. So 5 gallons would fill the tank half way and keep it warm in there. How would I put the plants in there without sinking them? I thought of using a gladware container and floating it on the surface, but if I did that I would probably need a large container so that the weight of the pots and stuff wouldn't sink it.
My mind is very narrow and doesn't always think of the best options... Is there any way I could make a glass terrarium retain heat at night while allowing light in during the day without having to add/remove insulation every day? The terrarium heats up to about 85-90F during the sunniest part of the day. Maybe stays about five degrees warmer than the greenhouse.