Most of the in-tank units marketed for turtles are fine for salamanders as well. If you're worried about the current, it's easy to place a stone or other decor to divert and lessen the flow; if you're worried about the intake, cover the vents with foam.

A low-current solution is to use a sponge filter; these operate somewhat similarly to undergravel filters, but are more convenient to clean and maintain. They are not very good mechanical filters, though, so you will have more debris accumulation than with one of the mini-canister filters like Duetto. A bag of carbon is really not adequate; you need biological filtration for long-term water quality.

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