So I started with a 10gal a month ago sort of rushed into buying stuff for it and I ended up with a submersible filter in there as that is what the store had. Then I did more research on filters and at the same time acquired a 29 gallon tank for free! I ended up going with a tetra whisper 60 power filter for the tank as I figured I could dial the flow back a bit and have room to grow if I decided to go bigger later on. I watched the 30 minute video of the aquarium co op guy hot rodding HOB filters. One of the big things they did was add a pre filter but, I kind of hate the pre filter from an aesthetic stand point as it makes the intake tube larger and more obvious. My next question is about the chemical filtration. It looks like most people ditch it and go with big sponges. Should I run it when I set the tank up then swap to big sponges? or just throw it in the trash and get big sponges for this filter. It also sounds like purigen would fix anything the sponges couldn't. Anyway should i just swap right away to big sponges then do my cycle and add purigen if needed for water clarity? or should I run what I have for a little bit then get big sponges and wedge the factory sponges in to get the BB into the new ones? Also where can I get sponges? does it have to be special ones from the aquarium co op site or can i get them somewhere else? trying to be budget minded here so if I can save money I am all for it.