coralline algae

[Kev135]

how do I get my coralline algae to take off I started my tank off with base rock and added a bunch of seeded reef rubble that was covered with coralline but it seems like it is not spreading to the other rock my tank has been running for about 11 weeks now and I still see nothing, What am i doing wrong?
My tank is a jbj28 with 105 watt 10,000°K/7,100°K combo cf lights I've checked my calcium it is at aprox 450ppm. I have not checked my alk levels what should they be at?

[Randy Holmes-Farley]

The chemical things that seem to help coralline are normal to high calcium (420-500 ppm), alkalinity (8-11 dKH) and magnesium (1300-1450 ppm), and low phosphate (<0.03 ppm) and organics.

It can also take a fair amount of time to develop. :)