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weird algae

3909 Views 15 Replies 5 Participants Last post by  TheFishGuy
I have a weird algae.......any ideas? Its growing like Coraline but its a fresh water tank.
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no the rock have be in there for a while though I did move the tank.
Its in the same location, I had wood floors put in.
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Its between the door and the window
Some of the rocks went on the back porch........some went in a 75g with the fish.. It is a hard crusty algea but flakes off pretty easy. whats a lichen?
well they dont seem to be harting anything and Im pretty lazy, so there staying,
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