Help with rainbow monti

[Ratpack]

I have a rainbow monti in my tank that was doing great. It is still growing like a weed, but all of the polyps have gone from multicolors to all green. All other corals are doing great including other monti's, acros and such. Alk is steady at 8dkh, mag is about 1350 and calcium is a little high at 500. I have cut the calcium dosing back. Any thoughts? Nitrates read 0 and so do phosphates, but I run Cheato in the sump, so I am sure there are some in there. Any thoughts?

 

[twon8]

Ime color is very lighting dependent

 

[Ratpack]

Do you think the green is due to inadequate lighting? I have LED's from Reef Radiance and they are set at 75% blue and 60% white / full spectrum.

 

[fishguy597]

I have the same thing happening. Mine is half way up the tank directly under a radion puck at 80%. I'm thinking about fragging it with a dremmal tool. I was asking about this and have noticed the new growth usually has the colored polyps.

 

[Ratpack]

Someone also mentioned that high nutrients would cause the color to disappear, but I assume that would be more of a total color loss to brown, not a color shift. Is that correct thinking?

 

[OrionN]

Rainbow and Poker Start have red/orange leading edge but mature polyps are green. This is just the color of this monti. When you buy a small frag, most of the polyps are new polyps so you have more color, mature colonies, only the edge polyps are rainbow.