I decided to vacuum the finer sand I had initially used to setup my tank and replace it with Caribsea Special Grade (1-2mm) sand. I was having so much trouble with sandstorms and constantly having to move sand back and forth where the vortechs had relocated it. I had tried different positions for the mp40s but no matter where I put them, they always moved sand when I ran them anywhere near max. I syphoned out a section of sand every few days and replaced with the coarser sand. I used dry sand rinsed well with my garden hose and then rinsed with RO water. Hardly any cloudiness at all and no ill effects. I can now run my mp40s opposing each other at much higher speeds with very minimal sand moving and no sandstorms.
I photographed my yasha goby / pistol shrimp pair and you can see a close up of the coarser sand