Fully agreed, but I have some idea of what is deficient with my Triton tests. I like the approach of just singling those guys out and seeing what their effects are first before adopting a water change policy. It motivates me more to keep the foundation elements non-fluctuating with no water changes than to allow them to fluctuate to dose trace elements, especially when I have a good idea of which trace element might need replenishment.
Say I'm out of iodine in my system... Say freshly made saltwater has 0.06 ppm of iodine in it and my target is 0.06 ppm iodine, that'd require a 100% water change to achieve my desired trace level of iodine! 250 gallons! Or I can just dose iodine at $10/bottle. Same with strontium or boron... 100% water changes if my levels are zero, which they aren't. The point I'm trying to make is only large scale water changes would bring me back to levels for trace elements and the repercussion it might have with the more important foundation elements seems not worth the risk at all for me personally.
This is all assuming that it is a trace element and not something biological with the color change on one acro species out of 40+ in my tank. Perhaps ice fires just take longer to adjust to higher nutrient levels. Could just be as simple as that.