help IDing

ReeferTide

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Need help IDing these growing on the rocks. Thanks!

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Looks like colonial hydroids. The best way to erradicate them is to starve them. They favor brine shrimp. Direct water flow towards them, not at them and they will get nothing to eat and vanish.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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