Can someone tell me what this is?

[SIG]

Hello, can anyone help with information on what this Alga or mushroom stones are?

Brown is slightly transparent and slimy is easily removed.

The water parameters are within normal limits after ICP analysis.

Thanks !

 

[TheSheff]

Hello, can anyone help with information on what this Alga or mushroom stones are?

Brown is slightly transparent and slimy is easily removed.

The water parameters are within normal limits after ICP analysis.

Thanks !

It looks like sponges to me, but if its slimy and easy to remove its probably cyano. Can you blow it off with a turkey baster?