yuma husbandry
imho, my pink yuma need strong lights and nutrients LADEN water. few years back, maybe in the year 2004, I brought a few stunning pink and purple yuma from ML. My no3 is around 20-30 and they are growing very Well.. yes, my mh is 250 + 150x2 and my yumas are growing so well that they split from 3 to 6 and 7 in no time. However due to my itchy backside, i deployed a better skimmer, hns 2 pump skimmer. and my no3 somehow drop from 30 to 10 and all my yumas melt and that was the end of my pink yuma. Even brother jmng pink yuma suffered in his pristine water.
so i guess they simply love those "dirty" water. 2 cents