IMO, UGFs are big no-no with turtles. i had a 20l set up similar to the tank in the link. i had 2 baby RESs in it for less than a year. when i broke the tank down the space under the UGF was SO nasty. i wouldnt want to keep that stuff in there wiht my animals. i havent used a UGF since, and i was a big advocate of them before that.
i think running a couple of large canister filters would do it for you. i moved my RESs and added a baby snapper to a 110. they were small, but i never had any problems. they had about 40 gallons of water and i filtered it with a fluval 404. monthly cleanings of the 404 was plenty to maintain a safe clean environment for them. i planned on adding another filter once they got bigger, but it worked fine for three small turtles, and the fish load i had in there.
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Landon
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