New tank live rock going grey

[bigfish]

ya i think its the sponge dieing off. It is the bottom part of my bridge that doesn't get much light. As far as testing, calcium is 400ppm nitrate and phosphorus is near zero and alkalnity is 8 dkh and lighting is 24" coralife 65w 50/50 PC with 24" T12 20w 6000k

[bigfish]

i read it was a good idea to brush dead spots off live rock. is this true, would it be better to just leave it alone

[JDigital]

Just a word of caution... That T12 6000K bulb is probably going to grow algae like nobodies business.