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Old 06-24-2013, 10:07 AM   #1
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Am in the process of upsizing my tank and I was moving some of my filter rock and found this on one of the pieces. Any ideas what it is ? Good or bad ? Lee
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Old 06-24-2013, 10:26 AM   #2
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Yellow sponge. Good guys and harmless. Simple filter feeders.
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Old 06-24-2013, 10:42 AM   #3
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So keep it in sump ? Or better in tank ?
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Old 06-24-2013, 10:45 AM   #4
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They are fine where they are and won't hurt anything. They grow under many of my rocks, I forget they are there.
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