Good choice. The only media you'll need if you choose to use what came with it is the sponge that goes in the bottom of the media basket. Just be sure you rinse that very well when you do your water changes. Like I mentioned before, you will have no nitrate build up at all if you toss the sponge that comes with it and buy a bag of polyfil from walmart or somewhere. It's cheap, lasts a long time, and it's safe. Plus its easier than cleaning a sponge every week. Just grab a hand full and spread it on the bottom then flatten your bag of seagel and whatever else you want to add over that and you're done.