The colt Coral is the only coral in the tank and has been moved around 2 or 3 times in the past 10 days or so.
Ammonia and Nitrite are undetectable - temp is roughly around 79-80 give or take a degree depending upon which thermometer you look at. PH is 8.3 and alk is bw 1.7-2.8 MH. Nitrates are high and around 20 ppm, phospates are at 1 ppm. I just received a shipment of phosban today and I hope it makes a difference when I add it to my system tomorrow. I also will be doing a weekly 13 gal water change. I did three 13 gallon water changes last week hoping to put a dent into my nitrates and phosphates and it didnt work.
As far as flow is concerned - I have a fluval fx5( 400 gph) emperor 400 (400 gph) and thre maxijet 600's on a wave making device ( 480 gph) total of 1280 gph on what is a 75 gal tank. There is good flow throughout the tank but I would not say that the colt coral is geting any direct flow.
Does it need pretty direct flow ? Also it is not turning black nor falling apart and nothing seems to be falling off it . It does look like it may be slightly a different color in this paticular area though. It has not seemed to get any better.