Want sumps for my 20 and 75 gallon reefs

Im a huge fan of doing it right the first time! Chambered sumps are better imo because they reduce micro bubbles and also give you places to do top off water and place a skimmer and even a refuge. Pumps are you get what you pay for.. you go cheap youll replace pumps all the time. Sicce and ehiam pumps are really good pumps with a good history. Keep the plumbing simple, and plumb for water changes where you valve off return water to the tank and open a valve that goes to your waste water container. Overflows are kinda a must have, not a fan of the syphon type, but they work. Check out www.elite-aquatics.net and see tylers sumps for ideas. Good luck!

I would definitely recommend a baffled sump. I don't beleive there is any reason not to baffle a sump. The main reason you see baffled sumps is for 2 reasons, 1 having a set water depth from a baffle for your skimmer is a must with almost every skimmer you are going to put in the sump. 2 a baffled bubble trap works great for reducing micro bubbles from your skimmer and also your durso stand pipe (if any).  Almost all skimmers availble today have a recommend water depth the mfg. recommends they sit in, the more stable the water level is the more "set and forget" the skimmer is going to be. If you don't do a baffle for your skimmer the water level inside the whole sump is going to fluctuate due to evaporation and you are going to have a skimmer that you are constantly adjusting to make it skim well. I would recommend a tank that has an internal overflow as well, stay away from syphon type exteral overflows they are nothing but problems. 

is there a way to make an internal overflow without drilling? Seems like a no to me...