Just to give an update.
A couple weeks ago I moved most of my corals over to Eli's place (caco3reef) for safe keeping and bought a new ro filter, the Tds coming out of the old one was 116, after the new ro it was down to about 14, the di resin took care of the rest.
Armed with all brand new water I began the process of draining and moving my tank.
I took out all the sand and could not find my sand sifting starfish, which leads me to the conclusion that it died and probably released a wicked toxin that started the major decline of my tank.
The tank is up and running with no sand and brand new water and already the green palys which were brown before are starting to color back up. I ditched the scrubber and the skimmer is running again.
Lessons learned: maintain the rodi filter, never buy a sand sifting star fish again!
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