The 2 gal is ok. I more or less just used it for short and cheap QT for my fish, but since I'm not getting any more its been sitting there empty.
There is a small pump that comes with the system that sits in a tiny separated compartment behind the black overflow which pushes the water from the back to the front through a slightly flexible direction outlet on the right side. There isn't much room for a thermometer though (unless you want to put it in the display part of the tank), and the two I have managed to find to fit in the back crapped out on me within a week.
The lights are nice and bright, but the lid has a huge hole in it for the light to shine through, so with fish in there/ having cats, in order to stop jumping or paws going where they shouldn't be, I had to cover it with mesh.
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