Thanks! I actually changed the layout before I abandoned this tank for 1.5months. I shall return tomorrow to witness the aftermath.....
And sand isnt hard :) place sand in a bucket and fill with the hose on high, so you have a tornado of sorts inside the bucket. this will stir up the lighter dustier particles. when you have enough water, immediately tilt the bucket gently and let the water out. the larger particles will instantly settle. these are the grains you want for your tank :).
sand packs tighter than gravel, and so debris will tend to rest ontop, rather than mixing with the sand. when cleaning, simply hoverr the siphon a distance from the surface of the sand and the gunk will be lifted from the sand surface :). I actually find it easier to clean sand :O
6.6g is a great tank! I wish I had the room for one D: I'm guessing that you dot have a filter running in the 2.5? other wise you can probably use the same filter to start the cycle in your 6.6 :)