Should I Be Worried About This? (black Stuff On Wooden Air Stones)

Discussion in 'Freshwater Beginners' started by Yoda, Apr 22, 2017.

  1. YodaValued MemberMember


    I installed them only 3-4 weeks ago, at the same time on 2 different tanks. Black stuff appeared at the same time for both.
  2. FahnFishlore VIPMember

    Appears to be some type of fungus or bacterial growth. Is this treated wood, and are these DIY?
  3. YodaValued MemberMember

    They're Lee's wooden air diffusers
  4. BodescaNew MemberMember

    It has happened to me too in my cycling tank. Would love to learn what it is.

    I also bought Lee's wooden air diffusers.
  5. Bizarro252Well Known MemberMember

    I have ceramic ones and also see this...

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