I want to be able to hold a combination of bream; shad; and/or herring. I'm currently using a 14 gallon keep-a-live. It's a nice system but it seems to be maxed out at about 3-4 dozen bait fish. I'd like to be able to put 5-6 dozen 5 inch baitfish in the tank on friday and fish until sunday. I think I need something at least 20+ gallons. It has to be a system with good water and air mix and that can be kept cool. It probably needs a filter system as well. I'm not going to plumb it through the hull of my boat if I can help it and surface temperatures are so hot during the summer anyway so I don't think it will have a fresh water intake. I've shopped the net and there are several options ranging from about $375-$500. I'm not saying I want end up spending that much but that's still a major investment in my book. I just wondered what you guys were using and how you rated the performance. I've used coolers, drums, and all sorts of other containers in the past. I've also tried several different air sytems. Many have done the job but none have been perfect. I was thinking about just building a custom box out of treated plywood, closed cell foam; and fiberglass but I'm not sure and I don't want to blow my budget without doing my homework first. What works best for you guys?