White marks on cork forest background..

[Heatheranne]

If it's not slimy, I'm betting it's calcium deposits, which are harmless.

[Pandora3d]

If it's not slimy, I'm betting it's calcium deposits, which are harmless.

do you think calcium deposits could be in substrate as well? i have something similar at the bottom of my tank - they look like little white dots, but don't appear slimy. i cleaned everything out on Friday, its now just Tuesday and i've already notice some more coming back.....sorry to jump in on someone else's thread, but they seem to be the same type of thing.....thanks!

[tmalla1]

Were having the same problem so its all good! The white marks do look milky along my waterfall and im just worried itll hurt my RETF