hello this is my first post so here it goes, i just purchased the nano reefpack for a 20 gallon reef i just started, the instructions dont say how much of the filter wading to use in the filter part of the pack, i am using 20# of sand that got very cloudy when i put it in so far it been 3 days and still cloudy, do i need to put the whole pack of the filter wading or part of it or do i need carbon, the instructions are very vague, thanks for your time.