I just got one of these for a 10G planted tank. Was just taking it apart and checking everything out, which was real easy. Had a few questions though. First off, any thoughts/reviews on these? People seem to like them from what I've read and they have a lot going for them. I have 3 places to store filter media, adjustable flow options, an air filter (venturi valve). I plan on using the middle flow option (B) so it's gentle and won't blow away my stock or plants (has 105G/hour filter rate). Does the venturi valve only work when you are running the top flow option (A). As that's what it is connected to, however, maybe it can still take in air? I don't know. Does anyone even use the venturi, would it be beneficial? Now it comes with the central BioMax container with the pieces already in it, that's fine. The 2 containers on the side each hold a sponge/filter pad. Now I can't tell if one of them is the poly/carbon pad or not. I'm assuming they are both just the foam pad as I can't seem to see, or feel, any carbon in them. This leads me to my biggest question. Should I get the poly carbon cartridge? I hear that plants do better without carbon cause it drains the water of nutrients and such. However will my moderately planted tank help keep the water clean enough where I won't need carbon? I also heard it's really just to get medications out of the water, but when they sell it they claim it makes the water "clearer" and gets rid of any smells. If I don't go with the carbon, what are some other suggestions??? They don't seem to sell anything specific for it, however since it's in a grated plastic container I figure I could most likely put anything in there. What are your thoughts on say a mesh bag filled with something (like Nitra-zorb for example)? What would be some other useful filter media? Or should I just keep 2 foam pads and just replace 1 every month or so and stagger them? Anyone use filter floss? It appears the same as a pad, what is so different/beneficial about it? Guess I added a lot of questions in there. Thanks for any info!