what is this?

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#1
found it growing, or being on my frag disc, wasn't there 2 days ago. any ideas?
it's the white stuff, center lower part of disc.
thanks
jonathan


 

Xirxes23

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#5
i beg to differ, looks like a moon crater to me... (more often called a sponge)

Sponges are a sign of tank stability, they filter feed but other than phyto not much is known on how to specifically keep them.
 
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#6
as long as it won't kill anything, i have all kinds of sponges just popping up in my tank, found a yellow one the other day when i turned a rock to show its backside.
thanks all
jonathan
 

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