Earlier today I bought an Arduino board for the paludarium, a mega 2560 just like the one I have on the 5 gallon shrimp tank. My first goal is to implement a ventilation system that is switchable between an open and closed system, with some temperature/humidity sensors integrated into it. There's also an inexpensive flow sensor I've had my eye on for some time. Rather pointless for the 5 gallon, but with how the water feature works in the paludarium I wouldn't mind getting some feedback on the flow rate. Maybe programming a couple small LEDs to give me a green light for good flow, yellow for adequate, and red for poor flow; at least until I can get a LCD screen for this tank as well.