I was overdue for an update
I took this tank down due to a few design flaws.
1 - the airlift tube was too small and prone to clogging with bits of rock / sand.
2 - the narrow tank made for a nice size but too hard to clean.
The little tank has lived in my sump for the past couple of months. I took it out to compare to the new tank which hopefully addresses the short comings of the previous one.
New tank next to old tank
New tank compared to a 12 oz can of soda
The new tank holds about the same amount of water but utilizes a closed loop for circulation. I will build a DIY inline heater for it. The tank has a much better footprint for aquascaping and the bulkheads enable me to have more options - I can easily add in a sump.
New tank specs - 5.5" long by 2" deep by 3" high. Tank volume 0.1 gallons.
Closed loop / two bulkheads (located in corners) using an Aqualifter pump to provide roughly 3 gallon per hour circulation in tank. Lighting is by a 27W PC desk lamp.