I am building mine in a water proof Integra box 10in wide 12in long 4in deep the acrylic the lcd is mounted in is bent at a 90 degree to slide down behind the top left and right post so the screen is held up in the air above all the boards all the wires will enter and exit the bottom to stop any water from wicking in down the cables over time or salt creep.
I will be putting a 5v PSU in the box to power the Arduino and temp probe's and possibly the Atlas stamps. I will try to run Ph1 for tank ph and Ph2 for the reactor ph and I have the Ec stamp and probe kit also just having problems getting them all to work at the same time. going to need some help on that soon. but I have the start so the journey has begun.