coral growth slowing down

[wetone]

I have a Colt coral which in a 2-3 month time frame easily doubled in size, it grew so much that it now has 3 main stalks connected to 3 separate pieces of live rock. I have fragged numerous pieces from this main coral. In the past 2-3 months this major growth spurt has slowed,(I also noticed my green star polyps whose mat was spreading everywhere is slowing too). All levels are perfect. The only change is I stopped feeding DT's about the same time (because I ran out and haven't replaced)Do you think this could be a reason??

 

[burtonjr]

How are your phosphates....a spike could retard coral growth?

 

[wetone]

Phospates, nitrates are at 0
70g with 30g sump, 125lbs LR, doing monthly water changes of 15g with RO water. 2 250w 6500k MH and 2 110w VHO actinics. Everything looks great including SPS, but have noticed slow down in the Colt growth

 

[kelly]

Your lights could also be starting to deteriorate. When is the last time you changed them. I have never used DT's, but if you stopped feeding them, it could affect their growth.

 

[wetone]

All lights are about 12 months old. The MH's are on about 5 hrs a day...the VHO Actinics are on about 8 hrs a day.
I guess it could be time to order new ones

 

[predator]

Those VHO's need replacing. I think that they should be swaped every six months. But I may be wrong on that.