Welcome Vickie. I've just set up a new tank for Discus and as others have commented the lighting is crucial - I had all kind of funny algae problems until I got it sorted. I look forward to seeing some pickies of your tank.
I have also gone for a bio filter using a fluval cannister and it works fine once the cycle is established. I used carbon for the first two weeks then replaced it with more bio media. I have previously found that apart from occasionally replacing the filter wool leaving the filter alone to do its thing is the best bet.
Cheers!