Few questions on my fluval 204

ok here goes,

I got it off somebody through craigslist for dirt cheap.When i got it home it was really dirty but i got it for nothing.After cleaning it i was wondering if i could use the same water polishing pads that were already in there?i have cleaned them vigorously except they are a stained brown color is this alright?would like some thoughts on what to put in the trays?i was thinking filter floss on bottom,don't know what to put in middle and some crushed coral on top.what do you think?Also on the filter floss can i use some polyester stuffing rather than go out and buy a bag of filter floss?And finally is there a way to clean the tubes?The person that had it before me switched out the ribbed tubing for some clear tubing which i think is good as the ribbed would become clogged really fast.So any replies would be greatly appreciated.

Thanks Kyle

So pure bleach?How much do you recommend?i will go ahead and replace the polishing pads.So you would put sponge on bottom,poly in middle and bio media on top am i correct?what type of sponge would you put in the bottom?

okay thanks will go out tomorrow and get some new sponges.i just need to figure out how to prime the dang thing to start it.

thanks...i didn't get the manual with this thing and have looked online and found the instructions on priming but didn't really help anyways thanks i will set it up and let it run.oh and can i use just a regular dish sponge or something?

yes those are what im going to buy tomorrow but you said to use sponge on the bottom tray right?i thought you said sponge bottom,filter floss middle and bio media on top.yes there are 4 big sponges in mine then three trays i just need to know now what to put into those three trays