I like the oval style that rock posted. The way he has it set up he can run either fresh seawater in and out or close the valve and run just the bubbler. This way the macks can be brought into the freshwater and stay lively for a long time (fresh water would kill them quick). For outflow I have a plastic screen of sorts that stops fish from getting stuck in it, works well (5$). Go to livebaitlarry and check it out, some great tips and cheap parts to build your own.
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