Donate your own wisdom when the time comes. It's a never-ending chain of helping!

I think an air pump may be overkill, but if you let your water sit out anyway, and airstone isn't all that bad an idea. MAke sure you check the pH after adding your nutes and before use, and never pre-mix fert solutions.
Good, stagnant water is bad bad bad and the source of a gazillion problems that plague growers.