My biggest problem is the fine sediment the sand bed is stirring up. Also i had followed some bad advise a year ago when I set up my tank and used bottled water ( later found out it was just municple water that was dechlorinated) so I have high sicates...and a cynobacteria ( red slime) bloom

. I purchase a 150 gpd 4 stage ro/di system last month and have been gradually changing the water in the old tank ( 55 gal 130lbs lr, 65lbs ls). Now I'm gradually trying to change all of this to my new 55 gallon in the family room ( much better placement than the old tank).
Let me know how you move turns out as I am having a hard time too!!!
Good LUck!!!!!!!!!!!!