what IS this???

[kaleysalen]

ok - so i have my tank & live rock set up for a year or so now - I recently re-did my lighting and added an additional bulb [a blue actnic bulb] - ever since I put the actnic bulb in.. I have 2 different "THINGS" growing from my rock.... I have searched the internet and can't find anything saying what these might be.... does anyone know??? HELP!!!!!!!
-see attached pictures-
kaley

 

[poniegirl]

Hi Kaleysalen, I think the first photo looks like something I purchased on some LR. Some folks on this site thought perhaps a type of sponge. Mine has spread (VERY slowly) and has developed long tubes (looks like yours) that stick up toward the lights. Hasn't seemed to be harmful at all.

 

[kaleysalen]

well COOL then!! i thought maybe the were some sort of sponges [both of them] but only that long ones seems to be growing -but hey, as long as they aren't harmful!