"I combined the Magnum 350 Pro system with an undergravel filter, and it works great to keep my 55 gallon turtle tank clean.
The internal canister setup is much easier to deal with than the Proquatics 2400 I replaced, and cleans better than the Fluval 404 I had several years back. It is harder to assemble and install than any previous filter I've owned, and the instructions are pretty poor in regards to tubing assembly, but with some common sense and patience, it's worth it.
Very quiet, amazing water flow, great surface aeration with the Bio wheel. Incredibly strong motor that self primes almost instantly with dry tubing.
The bio wheels and inlet/outlet assembly have mounting previsions to lock them securely into place. Very important with a 5 year old turtle that is strong enough and stubborn enough to mess with the setup."