Its really something I have seen over 30 years of keeps SPS hundreds of them. When I had a basement full of tanks that had tanks with the same corals in them from the same mother colony and would play with variables to see what they liked and what they didn't like. What would happen if a changed the flow direction and amount over the coarse of a few week or a year. Example in my current tank I had a two frags in the same spot for 7 months now. All chemistry was the same ICP testing no differences in lighting monthly Par check to make sure my MH hasn't shifted any. So I installed a inc cap 1 k gyre pump into the tank and observe how the flown is in the tank. After a week I had these two frag RTN. Two of the same pieces in another part of the tank have soon no ill effect.Can you elaborate on this? I've switched between a number of different pumps and flow characteristics and never had a fatality. I'd think the change would have to be pretty extreme to result in this type of reaction from the coral.
I have learned to be slow and watchful over the many years in the hobby. An it is also something I have learned being in the maintenance field for 34 years now. SPS have three factors in health light flow and chemistry get one of a little and their health will tip fast in a bad direction. Nothing complicated.