bubbles in bio balls

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amv123

Feeder Fish
MFK Member
Sep 10, 2007
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I have a del rey 125 wet/dry on a 100g, along with an eheim 2217 and eheim 2213 with a turbotwist 9w uv. I've notice some bubbles (almost foam like) building up along the bottom of my bio balls. Any idea what this may mean? Should I be worried?
 
when i first set up my tank i had this to i took some of the bio balls out and it stopped good luck
 
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