I purchased a 14g pre established tank a few weeks ago it has 2 clowns some hermits and a snail. I Introduced a emerald crab and a Sand sifting starfish. I have started noticing these white strings everywhere connected to rock and even some in sand. Based on my research it seems likely they are tube snails however they dont look anything like the pictures im seeing! Please help, new saltwater hobbyist here. They areVideo of problem