$40 upsidedown fishtank in pond

[pontyrogof]

I recently made a small observation cube from an old glass beta box for my temporary winter tank, a black plastic pond liner. I like to see my pleco eating.

I posted this elsewhere on this forum to teach someone about making your tank interesting for both you and your fish, and then I realized someone must have posted a thread about upside down tanks. The gravel vacuum WITH A CHECK VALVE is a great tool.