Started replanning for the 75g. Have 100lbs a mined dry rock in a bucket of saltwater going through a cycle. Using microbactor 7 and pure ammonia to dose. Going to build a stand similar to the one for the 125 but I'm going to use 2x6 for the top box and will have no center vertical bracing on the front. For the sump im thinking about building a diy out of 1/4" acrylic. I have it schetched for a 36w 16d 18t. Ordered a marine depot medium overflow box thats similar to the eshopps eclipse. Has one main drain and an emergency drain. Can have in drain from the tank into the first chamber then overflow onto a shelf with 3 4" filter socks that drain into the skimmer section, then a bubble trap to the refugium then overflow to the return pump section. Will have a total capacity of about 44 gal and will have around 27 when running.