Do I really need this much filtration ?! ETA: Now with diagram! I have a big bulky filter with three clip-together cartridges. No complaints, as my tank is cycled. However, today I looked at another filter designed for my size of tank/bioload (15L with single betta) and its media compartment was tiny - easily the size of a single one of my media cartridges. Since the height of my filter might become a squeeze once I have gravel, I'm wondering if I can "consolidate" the cartridges by [see diagram below]. There doesn't seem to be much "caught" in the coarse mesh anyway, probably because the intake holes for the filter are tiny, so nothing big can get sucked in in the first place. Is this a bad idea? Or possible? ETA: Since it's a bit hard to explain, here's a diagram of what I mean (blue arrows show water intake locations/direction of water flow).