Bigger canister filter= more biological media and More filtration 2 reasons right there.
Honestly some of your arguments just make me shake my head
Why do they make you share your head, its a fairly simple concept to grasp nor have you countered it with anything.
You need X bacteria to grow to support the life in your tank, this is of course dependent of your stocking and how much you feed. In order to support X bacteria you need Y surface area the two are directly related. It doesn't matter how much surface area you have as long as you have at least Y. An appropriately sized canister filter (like the person already has) will have an order of magnitude more volume for media than is actually needed to sustain life, adding another order of magnitude more will not change anything because you still only need the same amount of bacteria. All that happens is you spend money and nothing changes within your system and its ability to sustain the life its holding.
Most people (particularly online) grossly over estimate how much surface area is actually needed. Where you do have an oversized filter you'll gain more enjoyment from dedicating the extra capacity to mechanical filtration so you can get the water as clear as possible.
Unless there is an genuine reason to change it, like its noisy, it leaks, you genuinely need more flow or want to eliminate a heater/power head from main display then there is no point in 'upgrading' an established functioning filter (particularly when its already very high quality). The return on any money spent is practically zero.
As for
@Siliconslave the Eheim classic is An absolutely fantastic filter and i would personally recommend it above any other available. If you
Want to upgrade for the reasons i posted then i would be sticking to Eheim and getting the
Next model up.
Imo tho it isnt needed unless your struggling with levels or need More flow etc.
I basically said this in the first post I made....
Pointless upgrade uness you are going to move some equipment out of the thank such as a heater or powerhead.
Bigger isn't better once you get to big enough, its just bigger and the additional flow can actually stress fish if its too strong. I just don't understand this constant obsession that now exists on the internet about canister filters and the constant want to upgrade both the filter and the media inside it if what you have is already enough to deal with your tank. There boring, are closed away where you can't see them and add next to nothing to the experience. In all my time fish keeping have I ever seen anyone walk up to a tank, immediately open up the cabinet and go 'oh yeh that's a nice canister...'. Spend your money making your tank look nice like some killer hard scape, or upgrading the stock lights to something decent.
