Tunze nano ato issue

[gregzz4]

If the controller is the same as, or at least similar to, the 3155, it only has either an 'on or off' output
Could be a faulty controller and I'd suggest returning it to the place of purchase
At least for inspection, or better yet a swap

And for the pump hookup, it's not polarity sensitive so either way to connect it is fine ( with my 2 Osmolators )