Daniel

It is a big low-tech tank in disguise 🙂

I was wondering... It has no filtration, but is there an air stone or a powerhead? do you have some kind of current making device, or is it totally still, aside from any convection created by heat differentials?

There is a recirculating pump. It is the green pump in this picture. Once the water is in the tank is goes in a big loop and down to this pump and up the up again to complete the circle. But no airstone or anything in the aquarium. It is not totally still at all, there is a noticeable flow in the tank.