The Cryptarium

Made from a 6x2x2 aquarium that could no longer be used for water because the silicon holding the braces gave way.  I removed the bracing and rolled the tank onto its side so the opening is now on the front.

A new piece of polished glass is siliconed across the bottom of the opening to hold the water.   The opening is closed off by a piece of twin-wall polycarbonate with a couple of cable grommets installed as vents and handles.  On a hot day the afternoon sun through the window was pushing the air temp to 40+C before the vents were installed.  Some corrugated translucent polycarbontate sits between the tank and the window to diffuse the direct sun.

To keep it neat and tidy I mounted the heater in a DIY PVC external enclosure in the cabinet.  The base of the tank is drilled at each end and bulkheads are installed that allow a loop of 16/22mm hose lagged with closed cell foam to connect the tank to the heater chamber.  It works by thermosiphon without a pump.  Hot water rises from the heater into the tank at one end and cooler water sinks out of the bulkead at the other end of the tank and circulates back down to the heater.  The heater is set to 20C.

This new growing space replaces a couple of the polystyrene boxes I was using.