Just my thoughts, but a random RTN to only one coral would make me look hard at what I'm dosing.
Not all corals will need or want some of those at certain levels. Each coral species has it's own set of specific bacteria that feeds the coral and an upset can cause a negative change or RTN.
I'd only dose cocktail mixes that have what's in them labeled on the bottles so you don't accidentaly double dip on certain trace elements. With these trace metals only being in natural seawater at parts per billion levels it's easy to overdose and there's a fine line between dosing being good and heavy metal damage.
Koralcolor doesn't list what's in the bottle but they stress not to overdose.
http://brightwellaquatics.com/products/koralcolort.php
I'd also note your green corals are showing the best response and the blue coral shows the RTN.
My personal suggestion would be not to cross mix different brands, it's what gets people in trouble. It's going to be most widely problematic months down the road not in a few weeks as it may take time to skew the levels.
Replenish and Koralcolor seem to work hand in hand for example.