hey everyone!

right now i have a 30gal cube tank with a heater, a cpr bakpak protien skimmer and 1 extra power head, with about 30 lbs of LR. Can anyone recommend any extra equipment i might need, becuase all i have right now is the very basic filtration, i would like to purchase some new equipment that i might need and dont really know that i need it so if anyone can help me out with a few ideas it would be great. Oh and just for the record i have thought about hooking up a sump but my main worry about that is it overflowing, i just dont want to take a risk, but if anyone has any other information to prove me wrong or to give me some confidence then lets here it becuase right now im being a real chicken about adding new equipment to my tank.