[ID] Anyone know what this spongy stuff is?

[Tanster2]

My 30 gallon never ceases to amaze me. I always find something I’ve never seen before growing in this jungle. This time it’s some white spongy looking mass that seems to be choking my generic green palythoas. Anyone know what this stuff is?

 

[hzheng33]

it's just sponge. usually found in area of low flow low light. i have some in my sump as well (different from your typical pineapple sponge). pluck it out if you want to to avoid suffocation