Sponge or bacteria bloom?

Thakki

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Tank is 4 month into cycle...bare bottom...not turned on the lights...75% of the rock is real reef dry rock and 25% is live. Dosed microbacter 7 and ammonia to kick off the cycle. Tank is fully cycled...after 3rd month mark I started seeing white sponge like thing at the bottom crevices...slowly started spreading on the bottom of the tank...anyone seen this before. Seem like a filter feeder to me.

20200913_142109.jpg 20200913_141833.jpg
 
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Thakki

Thakki

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I think so too...but never seen it spread so much and fast...is it because the lights are not on yet?
 
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