Good or bad

jacohall

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Looks like some macro algae. Not bad. But can quickly spread, so get rid of it as soon as possible if you don't want it in your tank.
 

viper357

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The picture is not very clear but have a look at Caulerpa nummularia, see if that resembles it.
 

viper357

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Yes, but you need to try and get every little fragment of it out, roots and everything, otherwise it will just keep on growing from the smallest piece left behind.
 

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