Identification help white ball growing

[Deathnoter]

I have two of these growing on one of my plugs attached to a mushroom and one growing between some rocks. I’m not sure what they are.

 

[Chris Spaulding]

Pineapple Sponges Good filter feeders.

 

[ISpeakForTheSeas]

Agreed - pineapple sponges. Harmless filter feeders that are common in newer tanks. They typically boom in population and then go away on their own after a while.

 

[vetteguy53081]

I have two of these growing on one of my plugs attached to a mushroom and one growing between some rocks. I’m not sure what they are.

These are derived from silicates and favor shaded area of tank and with low flow. They as mentioned soon dissolve and are gone and feed mainly off algaes

 

[Deathnoter]

Pineapple Sponges Good filter feeders.

Thank you ….