I thought I would share my observations so far having run the hydra's for 30days.
#1 they are much more powerful than expected.
#2 most of us run these to high at first and see instant positive effects.
#3 after a week or two if not lowered we see negative effects like bleaching and browning.
#4 having red is a blessing and a curse - most of the time we start red to high creating algae on the sand.
#5 treat UV and Violet in the same % range.
#6 lowering or moving sps.
I have now lowered all spectrum's - dropping uv,violet to 30% - dropping rb and db to 70% - red to 15% and green to 25% (shortened red and green photo period to 4hrs)
white @ 40%. I am going to leave as is for 1 month with a 15% cloud@60% - I am hoping that my monti's,green dragon and millie will recover and lighten up my birds nest again. My acro's and pocillopora have been unaffected (good growth)
be watchful and react asap when seeing changes.
hope this helps.
Side note love the director - will even be better once they update.
these are great lights over all, well worth the $ IMO