What is this stuff showing up on my glass?

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armyman16

Aquarium Advice FINatic
Joined
Nov 12, 2011
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608
IM talking about the little white things.
The third picture makes them look like stomatella snails but they are definitely not that
 

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They do look like pineapple sponges. Is it a good sign or bad?
 
Good. They are just harmless filter feeders and will come and go.
 
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