The word "noodly" makes me think its mesentary filaments extruding from its side. My brain did this a couple years ago when it was STNing at its base. If you dont intervene it will likely die. I found that it wasnt getting enough flow around the base due to sitting on the sand bed causing cyano and detritious to build up just under its edge causing irritation. Try moving it to a higher flow location. Also. I use 2" dia. PVC pedestals for all of my sand corals. I cut them about 1/4"-1/2" higher than the sand and put the coral on them to allow flow under the edges. I havent had any problems since doing this.
Also, my brain was one of my very first corals from three years ago. It really hasnt grown at all and has for the most part, been quite healthy etc. I wouldn't worry too much about its growth.