I just bought a torch coral on Sunday...now today I notices some of the tentacles on one of the branches are darker in color and retracted slightly...all of my water parameters are good...calcium 450ppm, sg 1.0245, nitrates 5..p04 = 0. ....any advice...its almost to the top of the tank...Does it need more light? I have 130 watts pc. the other branches appear ok....