identification requested

This white translucent mound popped up overnight. Tank is well established, without any major issues for the past 2 years. Any ideas? It seems rigid and sprouted from one tiny stem like branch. There has been no change in size over the past week.

Noticed this scurrying around my glass recently. Are they flatworms and are they cause for concern? I have had a string of bad luck lateIy and I am currently treating the tank for Bryopsis and Dinos.

Hi guys, I suddenly found some small creatures on my tank glass and they are eating like a snail (but without shell). What are these? Should I keep them or eliminate them?

No bubbles in this stuff except when matted on algae. It is a fluorescence orange when under blue light. I'm stumped and thinking it's cyano or maybe some kind of dino. any help is greatly appreciated

Please help me identify this Conus species found near Kapalua, Maui (I think). No, I am not the Darwin Award wannabe holding it.