growth in tank-- any one know what they are

[mike17kb]

I have a bunch of these little things in my tank that are circular and have a blueish-green balls. They are about the size of my pinkie thumbnail up to about a 1/2" diameter
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[KrisDeitz]

Looks like a sponge

 

[dawgface]

Filter feeding sponges = Good or at the very least not a pests/problem.

 

[mike17kb]

Thanks.. after looking more they do look like sponges... just noticed them after re-doing some rock work and wanted to make sure

 

[qasimja]

when in doubt taste it! j/k lol