White growth on live rocks

Rovii91

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Hi all, new to the hobby.
Ove got a 30Gallpn tank with approx 17kgs of live rock and live carab sand.

I'm running a protein skimmer, fluval 207 cannister and salinity is at 1.024 at 28 degrees.
But I've just noticed this smooth looking white growth on some rocks.

20210422_141713.jpg 20210422_141658.jpg 20210421173933s.jpg
 

vetteguy53081

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This appears to be a sponge material. Lift rock out and using gloves, pull by hand and even a pick and discard and finish by brushing rock with a firm toothbrush and hydrogen peroxide
 
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Rovii91

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I
This appears to be a sponge material. Lift rock out and using gloves, pull by hand and even a pick and discard and finish by brushing rock with a firm toothbrush and hydrogen peroxide
Should have mentioned this earlier, it's only 1 week old with seeded live rock - does that make a difference
 
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