I have two tanks for sale. The first is a 25 gallon cube with an internal overflow. The dimensions are 18 x 18 x 18. It’s in perfect working order and comes with the locline and rfg nozzle you see in the pictures below as well as the plumbing attached on the back. Asking $50 in cash, but will also accept trades.
I also have a regular 20g with the plastic cover. $10