I'm pretty sure I was half full when I emptied the 75... This is going to pute close with the rockwork I have. Gotta start cycling the rock from the 75 soon and make some more shelves...Nice! It takes a minute to start filling up the 125. When I transferred my jbj 28 to mine I was like......that's it?...looked barren. Cool times that it's happening for ya...long road!