Hi, in my tank i see lots of particles, regardless of how clean my filter and tank is, its a dicus tank so i keep the water pristine, so i was considering gettng seachem clarity to clear up the particles, but one question, it says only for mechanical filtration, im guessin thats just a filter? i use a external tetratec 12000 without carbon, so is that mechanical? and something about filtration floss.. do i need this, or will the product still work?