What’s growing on my rocks?

Zbryant

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I have some weird white/clearish stringy stuff growing all over my rocks. Any ideas?
 
Might want to research chrysophytes
 
Looks like Octhodes and poriferan sponge growth. You should be able to lift or peel off if it has established itself well yet.
 
It’s not bothering me if it’s not going to negatively impact anything.
 
It’s not bothering me if it’s not going to negatively impact anything.
It will. It choked the hell out of my corals and lost of people on my Instagram had the same experience. It’s a major pest
 
It's a sponge I'm glad to see in my tanks, I'd leave it. Most sponges that grow well in our aquariums are essential recyclers and remove the hydrophilic and hydrophobic labile DOC much much faster than the bacterioplankton. If you're intersted in reading more on cryptic sponges here's some links:

Sponge symbionts and the marine P cycle

Phosphorus sequestration in the form of polyphosphate by microbial symbionts in marine sponges

Element cycling on tropical coral reefs.
This is Jasper de Geoij's ground breaking research on reef sponges. (The introduction is in Dutch but the content is in English.)

Differential recycling of coral and algal dissolved organic matter via the sponge loop.
Sponges treat DOC from algae differently than DOC from corals

Surviving in a Marine Desert The Sponge Loop Retains Resources Within Coral Reefs
Dissolved organic carbon and nitrogen are quickly processed by sponges and released back into the reef food web in hours as carbon and nitrogen rich detritus.

Natural Diet of Coral-Excavating Sponges Consists Mainly of Dissolved Organic Carbon (DOC)

The Role of Marine Sponges in Carbon and Nitrogen Cycles of COral Reefs and Nearshore Environments.
 

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