I have an established euphyllia section of my 180g tank with orig 6 multihead torches; over the course of the last month & 1/2 I’ve lost a couple colonies seemingly 1 head at a time. It also seems to only affect 1 colony at a time with all the other torches looking fine... I’m about to lose another colony All my water parameters are in check, I do weekly water changes of 10ish percent, haven’t noticed any menacing fish, cuc or bugs... any ideas/advice is appreciated.