how to remove phosphate

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I don't have any issue with what you suggested. If you think the sand is acting as a source to foul the water, best to get it out if there. Just don't let it get stirred up. Make sure the siphon is getting it.
 
Probably best to just turn off return pump and take most of the equipment out of sump. Drain most if the water out into buckets and put live rock in there. Then remove the sand completely and fill sump back up.

If you can fit any live rock in display temporarily do so.
 
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