White mold looks like cotton ?

[brianguz760]

https://www.reef2reef.com/index.php?posts/2564121

White mold looks like cotton ?

What's up guys it's been a while since I've posted anything on here. I've had my 60 gallon saltwater tank with about 40 pounds of live rock up and running for about 10 months but recently I've noticed......

 

[Reefing Madness]

Its just sponge, no need to worry, its a filter feeder and won't harm anything.