White spots

wesleyclement85

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What's these white dots on heater and back glass? I'm assuming it could be bubbles but not for sure so just checking.
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Looks like Spirobid worms..
Harmless filter feeders if that is them...
Or, they might be just calcium deposits...
 
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IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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