What is this?

[andy1990]

Hi all,

a couple months in to my new nano tank, 25 gallon and starting to get my first algae growth along with something else. Anyone know what these flower like things are?

 

[ISpeakForTheSeas]

Those are feather duster worms - harmless filter feeders.

 

[Fish Styx]

Tube worms- feather dusters. They are filter feeders and a sign that your system is maturing and healthy. Congrats!

 

[andy1990]

Perfect thanks, they were on that rock when I bought the hairy mushrooms and started spreading to the sand on the algae and wasn’t sure if I should get rid of them