How to filter this tank???

[chris a h]

I'm setting up a 55 Gallon brackish water tank as a father/daughter project with my eight year old daughter Joanna. I bought the 55 used and it came with an old Magnum 200/220 Cannister filter that works fine.
Kim, the manager of the very good lfs that I buy from said that the magnum will wor fine for mechanical/chemical but stated that I need a sponge filter or a wet/dry for biological.
Both Joanna and I would like to upgrade this to a saltwater FOWLR or Reef when she is a little older and better able to take care of it, so I need to prepare for this.
But with the lower salinity a skimmer and LR will be useless.
Any ideas?
Chris:thinking:

 

[fshhub]

why not just do the fowlr now???
it would probably be easier, and there is alot more she will want to do with salt than brackish water
a fowlr is pretty easy to set up and maintain you can get a skimmer and some rock and you are pretty much set up
instead of buying a good filter like she reccomends, get the skimmer
you already need the salt and test kits
a fowlr is easy to set up and fairly easy to maintain