I guess I just don't get it. Seeing as I've never owned a cannister filter, I have a question or three:
1. They are generally used for aquariums >= 40 Gallons. (T/F)
2. Can you adjust the out-flow?
3. For larger tanks (55g +), would one cannister provide adequate filtration or would/should you use two?
4. My HOB
's (TopFin 30) use charcoal with 'cotton' waste trapping stuff, does a cannister have something similar that needs to be changed/cleaned on a regular basis?
As always, thanks!