I put down rubber tile in the fish room. Much easier on the knees when performing maintenance below the tank

Easier on the feet too, with a much cleaner look. Inexpensive and from Amazon, if anyone is interested.
Now to the nitty gitty with the tank. I'm really starting to hate the fine substrate. I cannot manage to keep enough flow and not have the sand shifting and blowing all over the place. Others seem to be able to manage this somehow, but this just isn't working for me. It's becoming an issue as the fine sand blows and then accumulates around the base of corals. So I will be removing it.
Now the issues I have in doing so are the structure and how much this will disrupt the biology of the system. The structure is basically large, independent rocks which I'm not entirely happy with at this point. Any suggestions on how to approach this? I may be able to have someone hold all of my livestock if that's determined to be necessary. However if anyone has gone thru this, I'd like to hear about it and anything they encountered that they feel is worth mentioning.
Another item to mention is PO4 has basically dropped off of the charts. Is this due to the aragonite substrate coupled with the use of kalkwasser? NO3 has remained a rock solid 4ppm. Really no rise or fall in that number.
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