Xenia wilting and Hammer Coral -Branching

[mgmcotton]

I have aXenia and Branching Hammer Coral. The Xenia has wilted and withdrawn where it looks like it is dying. The Hammer has withdrawn to hardened nodes. They have been in their spot for almost a year. Both the Blue and White lights were replaced in March and I tested the water last week. PH, Salinity and Amonia level were perfect. I have done 2-50% water changes over the past two weeks as well to see if changing the water would help. I have added some Coral Vite and Iodine as well.
I have Mushroom Polyps, small leather toadstool and Encrusting Star Polyps that are having no problems. In fact they are growing well.
I have a clown fish, 3 snails and 3-4 crabs in my 14 gallon BioCube.
Any ideas of what I should do?
Thanks.

 

[i<3reefs]

Why a 50% water change?

 

[mr.clownfish]

i think ur problem is in the lights biocubes have like 8 watts of lighting.

 

[imarkspeed]

I'm having the same problem but I have a 180 with 2 175 mh and 2 90 watt pcs and every thing testes fine

 

[flower]

Your lights may be new...I would change the bulbs anyway...I hope you tested before dosing with iodine. I really think it is the lights...the corals with the problems are the neediest light users.
Run some activated charcoal in the filter, just in case of toxins. Look over your tank real good and make sure a penny hasn't been dropped in there. (this happened to a friend so I mention it)

50% water change when everything tested right was a bad thing...you loose good bacteria and stuff gets imbalanced real fast in 14g. So in the future...do no more than 20% .. 30% max.