The Lighting Controller

is there any way i can use pixles to controll a led pixle screen over artnet output?

Yes, with the limit of one Artnet universe for one 512 channels usb interface.
In other words, the software is able to manage only low resolution (no video).

To set up Artnet: https://www.youtube.com/watch?v=mHrl4Q5kXp8

Will the software control more than one universe if you have more than one interface: For pixels? For regular light scenes and sequences?

Will the software work with the Net-x interface for multiple universes? Can you do it over artnet without a USB interface connection? Would any USB connection required, like a separate interface, to activate artnet? I would like to make the software work without a USB interface connection, and am willing to buy the Net-X, if it will do that for me. The reason is that installing cat5 cable or a wireless router, is easier and cheaper than running several DMX cables over a long distance between the controller and the fixture location(s).

Yes, Pixels supports multiple universes (max 6 universes).