First one failed horribly, the magnetic stirring bar wore through the bottom of the reactor a lot faster than I thought it would (I knew it would, just thought it would last longer)
Version 2.0 now has a brushless led fan (so I can see when its on), a larger stirring bar, and a thin glass plate glued to the bottom to prevent it from drilling a hole through the bottom.
By turning the speed up I can agitate it from top to bottom, in the pic its running at half speed so fan speed is not an issue.
Version 3.0 will have a variable speed motor with speed controller and hopefully be made from a new style vertex reactor