Well, thanks SMinNC for you detailed paragraphs!
About the Co2 thing, thats okay, I was planning on just dealing with that by using a glass diffuser...
If/when I get around to useing a glass diffuser, I plan on putting it kinda sorta under the outlet of whatever. That way the bubbles will/should get blown sideways and stay down longer.
no that comes with it, you will need it in the future tho, im just going to fill my own media bags with carbon or ammonia chips, it will be much cheaper!