Get a sump! either buy or build! there are soooo many tutorials, diagrams and articles on it and it helps like crazy!
10 reasons to add a sump/refugium:
Personal satisfaction in building something
keeps water more stable
creates food for your critters
gives you another tank to aquascape and play with
extends maintenance intervals
makes an easy safe place to top off your tank
becomes an additional display tank
makes a low flow tank that can house sea horses and other sensitive livestock.