I love this post, I've read as much as I can on trace elements and respect what everyone is doing. I dose based on the fact I don't do water changes and My corals look "prettier" when I'm dosing something. I also have first hand experience with the fact that my algae turf scrubber actually bleaches (All algae on the canvas turns pure bleach white as snow). I asked around what would cause that. I thought I had introduced something toxic to hair algae. (If there is something that toxic to hair algae I want it bottled so I can sell it! )
I asked the maker of the algae scrubber and he said he's had a few people report that and it may be tied to a deficiency. I guess to eliminate hair algae, simply deprive one's tank of trace elements.
It's happened a couple times in the last 2 years where within 24 hours all algae on the screen just turns pure white and it doesn't grow. It scrapes off so easy that I'm pretty sure it's dead.
That said, since being religious about dosing trace elements, I haven't had that bleaching occur since. Plus, my coral colors all look amazing. I don't measure trace elements, but I give measured doses of them.
I think the argument at this point should be - is trace element dosing necessary for a healthy reef yes / no?
If it's healthy to do so, then we can argue the forms of trace elements until we're blue in the face. What I'm doing is working for me so far. I would love cheaper options, but, if it's not broken don't fix it.