if you just get the media it comes with hook it up and you will have plenty of time to google different medias you can use or just keep it the way it is, your making this harder on your self then you need to. polishing pads will clog faster i just use foam pads and nano bio balls foam pads are simple to rinse and reuse. so its really this simple buy the filter hook it up and call it a day and enjoy your tank. hot magnum or canister either one will work fine on your tank, if your buying on ebay make sure you know if its new or used 1st, send a email asking if all the parts are included
(alot of times yeah its new but a part is missing they dont say it is in ad but you ask and find out) and if its used ask if it works, does it leak, all parts included etc. and if they dont reply to your questions DO NOT BID ON IT. ebay can be a perfect place for excellent deals BUT YOU have to ask the questions, know prices of the item generally charged on the internet so you know if its a good deal and dont forget to add shipping to the price that can often turn a good deal into not such a deal after all. and always pay with paypal so you have protection and can get your money back if the deal goes wrong and you pay and get no package in the mail. AND most important to me is check there feedback score are they flakes? do they have negative reports? if they do PASS that deal on by because you know its going to be trouble if you dont. thats why most people get burned they dont do the homework or ask questions and just buy it cause it was cheap.