Help identifying sponge/algae in sump

[RickSanford]

Good Morning/Afternoon/Evening everyone,

I've searched for an answer before posting this and have come up empty handed. I'm in the process of doing a sump cleanup and water change to remove detritus. I removed the skimmer to clean it as well and discovered this behind the unit. The tank is doing really well so I don't believe its overly harmful but would like to know what it is. Looks and feels like sauerkraut. Thanks in advance for help with identification!

 

[vetteguy53081]

Crazy growth of poriferan sponge. Use a plastic scraper and lift and peel and discard

 

[RickSanford]

Thanks for the help on the ID. It was very easy to remove. I ended up with ~2 cups of material. Sign of a healthy tank I guess.......