White "starfish"?

Username177013

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Anybody here have a clue what these little guys are? I would like to know if they are a danger to my fish or corals.

16219828039984359231376627279455.jpg
 

jeffchapok

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Hydroids. They are common in new tanks, harmless, and will go away in a couple of days.
 

Freshwater filter only or is it? Have you ever used an HOB filter on a saltwater tank?

  • I currently use a HOB filter on my reef tank.

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  • I don’t currently use a HOB filter on my reef tank, but I have in the past.

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  • I have used a HOB on fish only or quarantine tanks, but not on the display tank.

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  • I have never used a HOB on a saltwater tank.

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