Power Filters are an important part of any non reef tank and must be taken into account.  In this case we are talking about freshwater and saltwater fish only tanks.  I have not used all that many brands of power filters, but am loyal to Marineland Penguin series.  They pack just about all any one would want in a power filter.  Mechanical, Chemical, and Biological filtration all in an easy to use, easy to maintain compact package.  However, beware they are still nitrate factories.  That means they can only process tank waste to the point that it ends up as Nitrate.  Understanding this is key to using any power filter as they all have that in common.

    A 55 to 75 gallon tank of freshwater, or saltwater fish only, served by twin Bio-Wheel 330's with tube extensions works very well provided you keep an eye on nitrates and are committed to regular (monthly or bi-monthly) water changes.  A 125 runs a 10 gallon tank quite well.  The trick, if there is one is to use your own material to construct your "cartridges".  This is not all that hard to do once you have the parts.  I plan on adding a few photo's here in the future to illustrate this as it will be much easier to explain.

    You  need to understand that power filters are Not suitable for reef tanks at all!  I recommend that you do not even try it, you will be disappointed severely.  However they can be used on your seed tank, and for this purpose I can recommend you have at least one handy.