White things growing in AIO sump area

[the_chef_pierre]

Just noticed this white stuff growing on the walls of my AIO sump on my 3 month old tank. Now sure what it is. There small but kinda have tubules. Also found some growing on one of my rocks. Any ideas?

 

[the_chef_pierre]

Hard to capture it in a photo

 

[35ppt]

Harmless sponge.

 

[the_chef_pierre]

I wonder if it's the pineapple sponges that have started taking over my tank somehow

 

[Reef-Tank]

I wonder if it's the pineapple sponges that have started taking over my tank somehow

It will come and go so no worries specially that is new tank it happen some time. if you can keep your water clean and when the tank getting mature it will eventually go away no worries.

 

[clown99]

If they look like pieces of paper towel sticking to the walls, then they are indeed pineapple sponges. I don't know where they're coming either.