I'm planning on putting 120 pot scrubbers in a DIY sump which will be supporting about 50 gallons of fw....I'm building the sump big enough to support my 75 fw and just incase I want to turn the 75 to sw after I get out of college. I will be posting pictures of my DIY sump after I finish a couple things up on it. I just built the drip plate last night and am wondering if anyone can tell me how big of holes I need and about how many. Thanks.