I've used variants on that canister/undergravel combo for awhile, with no trouble. I've also had good luck with plain UG filters (using a powerhead, NOT the traditional arilift which isn't strong enough for turtles). Never tried the Magnum, I've been using Fluval all the way. I've use the big Fluval (400 series) in tanks up to 65 gallons with a trio of painteds with great success...I also had a common snapper temporarily in a 55 gallon tank using just the UG & 2 powerheads and it stayed clean. Turtle was maybe 4-5 inches long.

Agreed w/Chris re: algae & water changes. If your tank is near a window and you don't really want to move it just cover the side that faces the window - that should help. Also with a small turtle like the stinkpot you might be able to add a plecostomus fish (to clean the algae). Try to get a decent sized one (bigger than the turtle) and he should be safe. Stay away from the small algae-eater as the turtle will likely have a go at eating one of those; the pleco is armored, and gets bigger.

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