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Yup, never change the matrix, it's a stone that will carry your beneficial bacteria, if you change it or clean it under a tap, you will kill the nitrifying bacteria and cause a cycle in your tank. Rinse your foam in old tank water if it is blocked so much that the flow of your fluval slows down...

Matrix is just a normal inert biomedia, it has a consistency of pumice stone, it does the same job they all do, it is claimed thru marketing that it allows beneficial anaerobic bacteria to form aswell because it is dense, and this bacteria helps with the nitrification cycle and can digest...

No worries, hope it helps you out a bit, let us know how you go :-) If yours is anything like mine, the 405 will take a lot of priming, especially the filter wool and noodles, they trap air like a demon until the filter has run for a good while.. You will know when the 405 is truly primed, it...

Generally for mechanical filtration, the old rule of thumb is coarse - fine, if you go by traditional stances, SO, on that basis, you should have - 1) foam 2) noodles (pre filter mech) 3) pot scuffles (not a necessity, just a home DIY option) 4) filter wool for final polish If run in this way...

This is my current fluval 405 setup, I plan to supplement it with another filter, perhaps a 305 in the near future as I am at the limit for the 405 (100 gallon tall tank) but I prefer over filtering to help grab more detritus etc, unfortunately due to my hood design, I can not supplement with a...

Are you sure it's a fungus? If it is a clear or white colored swaying "halo" this an algae, and anc. Bristle nose will clear it up, it can also go away by itself once it starves itself out. I had the same problem with my driftwoods, one of which was months established in the store with an...

Is it possible to run sand and gravel at the same time, or does it become a mish-mash mess and hence one only one of the two media at any given time is popular?

When I setup my new 405 it was noisy, and i wasn't happy. I wrestled with it late into the night and I finally got it right and whisper quiet, which is how it is supposed to be, these are the hints i can offer that saved my from a long argument with the LFS.. I pulled the unit down, left the...

May I ask, at present i have two types of gravel in my tank (4ft 100 gallon tall) and I am thinking of switching to sand for the benefit of the cory's, yoyo coaches and bristle nose's. The two types I have now are medium round river gravel, which is a little smaller than the normal colored...