Another what is this thread. I'm fairly certain they are sponges, pineapple?, but just want to be sure they're okay. I've got them springing up in numerous places and they are about the size of a quarter to a dime.
Sponges?
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Crabs McJones
I'm so shi-nay
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Yup sponges 
I have these in my tank as well. Harmless filter feeders. Sign of a healthy system.
I have these in my tank as well. Harmless filter feeders. Sign of a healthy system.
