Thanks for all of the responses. I've got a good idea of where I want to go with the filter situation.
1 - Here's my deal: I cleaned my 55g tank a little too well to the point where there's a significant bacterial bloom (white cloudy water). It's been like this for about 2 weeks now. I have not changed anything other than that one-time cleaning (too well). It's on week three and the water still has not cleared up any. I know the key to bacterial blooms is patience, but is there any other way I can alleviate the load? Perhaps instead of the weekly water change, bump it down to 10% every other day to help? Other than the bacterial bloom, I've been testing my water and all parameters are in range. Fish are all eating, sleeping, pooping, swimming and even the Figure-8's have that little green fluorescent patch on the top of their heads.
2 - With that said: I'm running two HOB filters in the tank. If I were to switch my filters from the carbon to sponge/filter floss/biomax, would it be wise to change only one filter at a time to avoid a cycle? Or is that inevitable/irrelevant?
3 - In relation to the aforementioned question, is it suitable to use the biobags and blue filters (with the carbon removed of course) as a filter floss? Or best to add it? I guess my main question is; for those who do not use carbon in their HOB filters, how do you set-up?
Lastly - Because I'm going through this gigantic bacterial bloom, best to wait to switch over or best to go ahead?
Sorry for the massive bombardment of questions - I guess I really have no idea what to do in this situation. Any suggestions / help would be greatly appreciated. Thanks!