I currently have a 75 gallon tank stocked with mostly fish but I do have a few soft corals. I have about 100 lbs of live rock and about 40 lbs of aragonite sand which makes for a very thin sand bed. Today I purchased 10 lbs of arag-alive sand. The first question I have is how to add the sand without disturbing the tank too much? Also, will the addition of new sand cause another cycle.
 
The tank has been running for about 11 months.
 
The tank has been running for about 11 months.