I have been dealing with phosphates leaching from my rocks and sand for the past 3 months. I have tried lanthanum, gfo, rowaphos, nopox, np pro. It will go down to .07 but then back to over .2 the next day. Just used some chemiclean to get rid of the cyano. Should I consider replacing all the sand? Would this cause a tank crash? Not sure I want to replace the rocks but anything I can do there? My tank has been running since Nov 2021. I used new caribsea dry rock and sand.