What are these tentacle like things???

Makubex

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Im confused, they are coming from the inside of that rock i believe

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Makubex

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Makubex

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These look a bit diffferent, i could swear theyre coming from inside the rock holes
 

Timfish

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THey're sponges, good to have. SPonges are essential for healthy reef ecosystems. Here's more info if you're interested:



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.)

Sponge symbionts and the marine P cycle

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

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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Makubex

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I believe these are Syconoid sponges. Some sponges can be toxic if disturbed etc. Give it room and it shouldn’t be a problem much like any of your corals.
I couldnt find much on syconoid sponges, any link? Ty
 
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Makubex

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Do you know if this sponge is hard to take care of? I cant find any care sheets online
 

Timfish

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The cryptic sponges that grow in our tanks usually feed on Dissolved ORganic Carbon (DOC). Not much is avaialble because not a whole lot is known about their husbandry. As far as toxicity most sponges are a lot safer to handle than zoas or BTAs. Here's some links if your interested in some of the research on them:

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.)

Sponge symbionts and the marine P cycle

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

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.

Diet of Red Sea Barrel SPonges

Diet of 7 Caribbean sponge species
 
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