Help ID'ing this.

[Gulfdigger]

The attached picture is from my FO tank with live rocks (the tank 6 months old after the setup and cycle). While I was changing out the media from reactor chamber, I decided to clean the pump ( I normally just disconnect the supply water line and leave the pump only) I found white growth on the pump. Then I looked closely at the equipment in the sump and it is growing there too. What is it and if it harmful how do I treated/remove it?

72 G DT
90 g total volume
light load fish (2 long fin clowns, 2 dominos, 1 Diamond Goby, Blue tang, and the rest are hermits crabs.
Ph: 8.1
Amm: 0
Nitrate. 2.7
Phos: 0
dkH: 9.5
Cal: 345

 

[dedragon]

pineapple sponges, they are harmless. Very common in newer tanks