I have two tanks a 220 (72x24x32) and a 120 (36x24x32) The 220 I only have fine sand from Marco, I think 160lbs? And both fine and corse sand in the 120 I think 40 lbs of each. I moved in April and both tanks got refilled and new sand by May. The fine sand does need a lot of rinsing as stated, I like most was impatient. I had all of my fish and coral in totes, tubs, buckets, whatever I had left in the house when I broke tank down... I knew I didn't rinse enough but needed to get everything back into tank and running. When I first got everything back in tank I was not able to see anything (only about 3-4 hours after putting sand in). Because I wasn't able to see I couldn't do any aquascaping and just placed all rock and coral on the sand, next day or so I started moving some around, didn't get far, lost visibility. After a week or so I did get the general aquascaping complete. Power heads did create some more dust (expected) running 2 mp40 at 80% power 60-70% up side of tank. After about a two months sand storms were almost completely done, I added a sand sifting goby... When purchasing didn't think anything of it... Seemed as tho sand storms would never stop, would settle for a day or so and he would find himself digging and spitting sand in front of the wave maker. Now I am so glad that I just let it go, lots of changing filter socks but I truly looks natural now(will post pic when lights are on tomorrow). Sand was level and between the wave makers, sifter, gobies and dart fish the center 24" is about 1/4-1/2" deep and sides are 2-3" but tunnels and hiding places under rocks... In the 120 I was not in such a rush, I put the fine sand in first and corse on top, wish I would have either mixed or switched the order, on top looks rocky and almost like crushed coral, not bad but I can't put much in to stir the sand, I have a 12-14" snowflake eel, my snails and hermits keep disappearing. This too probably did require nor rinsing than I did, but water was so cloudy from other tank (same system) I couldn't tell the difference. This tank has 1 mp40 same height and power. I will also post pic of this tomorrow.