Check out the crazy fish tank! It’s a work in progress, but the form seems to work well. Now all I need is a heater and some fish. Like it says on the site, the project was inspired by hampster tubes. So far there are no major leaks (one slow leak on one joint, but that may be from the tube, not the seal) and the air bubble pump works splendidly. Stay tuned for updates. There should be fish shooting around the tubes pretty soon!