Help with new tank!!!

[trembly]

Recently started a 55 gallon community planted tank, I custom made a background made of real bamboo but it seems some kind of mold or fungus is growing on the bamboo. Has anyone ever encountered this or know what I should? I don't wanna kill my fish

 

[mohican]

Not really sure, but did you seal the bamboo before placing it in the tank?

 

[trembly]

Yes i did, some people said its mold others say slime. I have no idea