The lights on the arduino uno blink when the air pump turns on and off. This happens if I use the arduino to power the relay board or if i use a separate power supply for the relay board (by removing the jumper and connecting there). A 6v DC motor also connected to the relay board does not have this problem. Other devices connected to the circuit (servos) twitch when this happens.
I fear this is EMI and I am using a relay board that is not capable of handling an inductive load. This is the relay board. http://www.amazon.com/gp/product/B0057OC5O8/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1
If you need more info I can make a diagram of the circtuit.