Are these tiny anemones? EAch about 1/2 cm to 1 cm, looks like tentacles around a central base/mouth? Haven't seen them move, and don't think they look like the aiptasia I've seen (they don't have a stalk -- just tentacles & base). they're clear with sort of white speckling. Hope that makes sense? And yes, there are white/clear stringy looking sponges on here too... looking at pretty much dead center of 1st picture, and a cluster of them in the 2nd picture. Help me out?! Thanks!!