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Old 11-12-2015, 09:02 PM   #1
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Yellow sponge like thing, even squirted stuff at me

I've had this thing on this rock I got for a while, it never does anything or grows or moves. When setting up my new tank I transferred the rock (wearing gloves and using a toothbrush) I tried to see if he'd just fall off if I scraped at him. He started squirting stuff so I just ended up putting the whole rock in the new tank with him on it.

What is it?
Is it harmful?
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Old 11-13-2015, 09:58 AM   #2
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Just a sponge, no harm.
Syconoid sponge
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Old 11-13-2015, 10:25 AM   #3
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I found one of those too its very small but I didn't know what it was so i guess i do now.


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Old 11-13-2015, 11:07 AM   #4
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Old 11-13-2015, 11:23 AM   #5
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I have a big red one , yellow one , and a grayish one they are harmless , just having them in your tank tells you that your water quality is good .
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Old 11-13-2015, 11:53 AM   #6
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And if your water is not the very best they are great filter feeders.
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Old 11-20-2015, 12:55 AM   #7
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