Ok, here are some underwater power filters or filters that work well with amphibians.
the canister filter for turtles from zoomed. A great little filter and would be perfect for a newt tank with multiple newts and fish.
Zoomed Turtle Canister Filter
The Zoomed Turtle Canister Filter is specially designed to meet the unique filtration needs of turtle tanks or vivariums with amphibians. It features an extra large carbon chamber for maximum ammonia absorbing capabilities. Includes spray bar system, mechanical filter sponge, biologically active ceramic media and carbon. Its special water pump motor can run dry for up to 30 days without damaging the unit. Includes a manufacturer's one-year guarantee.
a little bit cheaper but another great filter.
Aquarium Systems Duetto Multi-Function Internal Filter
Duetto Multi-Filter is a compact internal filter that efficiently packs maximum features in minimum space.
The multi-filter internal chamber has separate components for mechanical, chemical, and biological filtration, permitting easy replacement and cleaning of the chemical and mechanical filter without disturbing the biological filter.
The aeration feature mixes filtered air with pumped water to provide complete aeration, improving the oxygen/carbon dioxide exchange. The multiple output adapters allow either flat output for easy direction of water, or round output for easy connection to flexible tubing.
The Duetto Multi-Filter is totally submersible and can be positioned vertically against the aquarium wall, or horizontally on the floor of an aquarium or terrarium.
Can be adjusted for minimum or maximum flow.
Elite® Stingray Underwater Filters by Hagen I have one of these I plan on using for my 10 gallon newt tank.
Fully submersible filter improves water quality and requires little maintenance. Sleek, modern filter design may be suctioned to aquarium glass. Features of the Elite® Stingray underwater filter models include:
* Quiet operation
* Easy to set-up and use
* Easy to maintain
* Each filter uses two carbon/Zeolite cartridges, one foam pad for the tail of the filter, and one filter pad for the body of the filter (all included with filter; replacement parts sold separately)
* 5 ft. of electrical cording
The have sizes that range for the 5 gallon to a 15 gallon tank.