Some of the Equiptment I have made or use
Here you can see the filter extension pipe along the back of  my 3 foot tank and the flexible pipe connecting it to the filter outlet. In this tank I run the output extension pipe over the internal lip in the tank as a waterfall. notice the prolific plant growth.
I use this setup to test and calibrate heater/stats-new and secondhand. Ruler for stirring water!
Kitchen meat temp. probe makes really good tank probe. Fast reading
Two siphons used for gravel cleaning, one for shallow tanks the other for 12 inch plus. The whale water pump is used for filling the tanks and water changes. Dont half save a lot of bucket lifting. Only drawback is 12 volts dc needed.
The fry growing on tank, long and shallow for easy cleaning. This is also the birthing tank as fish do better left where they were born. See also the brine shrimp hatcher. This is a developing measure with a plastic tube fitted for the airstone, over a coffee cup warmer. White stick is thermometer.