Sponge good bad ????

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Brycnz

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Hey guys not to sure on this one it’s purple and soft and it’s starting to brake away from the rock and fish want eat it only seams to be down one end of the tank under led while other end of tank is under MH

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I haven't heard of any 'bad' sponges, but go ahead and remove if you don't like the look of it.


there are even parasitic sponges which eat coral skeletonn my friend has had once or twice. I cant find the article on them off hand though.

Generally I wouldn't worry too much about sponge can be a helpful filter feeder. but it isn't always good it can choke out corals and some varieties are specifically dangerous to corals.
 
Looks more like cyano to me. It sometimes grows in thick mats when it's growing slowly. Siphon it out as suggested above and monitor it to see how fast it grows back.

Regarding the role of sponges in reef ecosystems cryptic sponges are essential recyclers and remove the labile DOC (aka carbon dosing) that promotes pathogenic shifts in the microbes in the coral holobiont ~1000X faster than bacterioplankton. Here;s links if you're interested in reading further:

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.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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