Thanks again for your response Shoggy.

In this case, would it be possible to connect an additional Aquaero LT unit to the Pro unit in the same way the poweradjust is connected? Will the operation be the same, ie will the Aquaero Pro recognise the unit as simply additional fan/sensor channels as opposed to a separate unit?

I also noticed the "powerbooster" unit on your site, would this be a suitable upgrade also, for expanding the number of fan channels available for control on the Aquaero 5 Pro? From what I can tell, it would be significantly easier and cheaper.