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I use a couple of different types depending on how i'm fishing and how many of us/herring we need to keep. For on the beach driving and a fair amount of people/bait we use a 100 gal 1000 gpm pump this one goes in the tank. mount the pump on the lid of a plastic jug. drill lot of holes in the jug and fill it with those plastic skin scrubber things, like a fake loofa [sp]
ask a woman or go most any store ocean state has all this cheap. then add a pipe or hose to the top with a diffuser to shoot the water back down. wire the rig to a mount works great all season, clean it once a year.
the second way is for a smaller tank. through hull type mount with an extension line inside then mount the same filter on the extension, run a second line up the side and through the top of the tank again clean it once a year if you like. ammonia will be a problem overnite.
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