Well afew weeks ago I upgraded my lights on my scrubber from led par lamps to propper phillips luxon 3 watt leds. There are 4 660 and 2 royal blue (at half power) on each side of my 5"x5" screen that has about 280gph flow. I went through the whole curing prosess with the difusers and such until I got a base of brown and green then removed the difusers. Now the only growth I am getting is jet black. After doing some testing I found my nitrates and phosphates to both be at 5ppm! I ran puragen and phos-guard,this brought the nitrate to 0 and the phosphate to 2ppm.. still nothing but black growth. Not sure what to do.