have a new tank live rock is 50 lbs of eva tonga and branch from a 3year old dealer tank that was transferred to my new tank...it is now 5wks...tank is cycled....noticed small custers of white "blobs" in low light areas on rock...seem to have two small "hair" like tentacles on end....what are these??...Sponges???...PESts??? please help send post and e mail please...thank you..i am a new saltwater aquariast and need your help...