cable length

So im in the middle of making an aquarium controller my question is im haven the arduino mega run a tft touch screen and i would like the controller at the bottom of the tank and the screen above the tank so as you can guess how long of a cable can i get away with from the arduino to the screen im using a arduino screen shield and a pc psu for the 5v thanks

Have all your punctuation keys broken?

Weedpharma

The first step is to determine which of the pins the shield actually uses. Then run wires for those pins. Ribbon cable is typically used for this kind of thing. An old hard disk or floppy disk cable from a desktop PC is a good starting point.