Not here to shill, just my personal thoughts:
I rarely do water changes and only when I vacuum out the detritus from sump. Water quality: Salinity 1.025, Alk 8.9, Ca 446, Mg 1451, PH 8.38, P04 .08, N03 20. My last month’s ICP results for other measurements were within normal range. Any new seawater added comes from Red Sea Blue bucket.
While at Aquashella, I got into a very thorough conversation with Lou Ekus
@tropic Marin concerning this topic.
I explained that I had been using AFR (All For Reef) for my dosing regimen (which does contain trace), and how well my tank and corals had been responding to changes from standard 2-part dosing regimen (did 2-part for past 8 years). I also mentioned that I was still having coloration issues with a pair of my SPS colonies. Two hard (for me) to color up corals included JF Flame and Vivid Rainbow Delight.
I had also mentioned to him that I was also supplementing AFR with Saturated Kalkwasser to raise/stabilize PH (8.38-8.40 daily swing). Lou had mentioned that with the Kalkwasser (slurry) portion of dosing, there was not any trace included, and that I should be supplementing trace for this portion. He gave me a formula to follow (based on Kalk use), and I had set up TM A and K+ (5ml daily) to solidify trace saturation in water. While not overnight (as we often expect with results), over 3 weeks of use I have not only been able to bring out color in both of these corals, but also increased color, PE, and growth with all corals (including LPS torch, hammer, frogspawn, SPS Monti, Acro, and Chalice).
Two more additional observations: In the sump, where I had failed (often) at keeping Chaetomorpha and Halimedia, are now thriving. SPS/Acro Coral mortality, while never a significant issue, has since changeover disappeared as an issue.
In my case, I feel strongly that trace has had a positive effect on tank health.
Sincerely,
David