I'm really surprised there doesn't seem to be more interest in this. Let me just add, for those of you that have not seen my posts in other parts of the forum, I began losing some acros in November for no apparent reason. Everything seemed in order as far as what I could test for except iodine was high. Maybe it was iodine, maybe not. I sent out for a Triton test as acros kept dying. I did a ton of water changes keeping parameters in check hoping to rid my system of whatever was causing this. Certainly no pests.
Triton test revealed zinc 4 times over normal. Also revealed a significant amount of copper in the system. Lost over 40 acro colonies over the month. Ck stag by the way, the original that began to melt, recovered and has already grown back over most of the area that died. I would estimate around 3k$ worth of dead corals.
$50 (OR 41.50 if we get over 12 tests kits) is a small price to pay, to know exactly what is going on in your tank!! Had I taken the test prior, it could have prevented a catastrophic loss.
Just to note, Lps all sps other than acros, ZOA's, etc are all still OK.