This doesn't look like any biofilm I've ever seen. It's like a half inch thick. Has the consistency of jelly. And has some air bubbles trapped in it. This mopani wood that was boiled for a bunch of hours.

Posted by forestdude

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  1. Had the same thing. Sometimes there’s still sugars in the wood even after boiling. This is a type of biofilm that forms feeding on the sugars. It goes away on its own after the sugars are gone

  2. My mopani wood did the exact same, it’s just biofilm. Once it was cycled I put in some livestock in there and they had a feast, cleaned it up in just a few days

  3. Mopani wood almost always does this when first put into an aquarium. Treat it like any other biofilm, it’ll run its course within a few weeks. Interestingly, I’ve seen it suggested that it might be a type of aquatic fungus.

  4. I had this on a piece of mopani wood. It’s disgusting, it stinks horrendously bad when you take it out of the water. I took it out and scrubbed it in hot hot water. Put it back in, biofilm came back in a day or two. Rinse & repeat, still came back. After a few days/weeks (unsure) and few more removals/scrubs, I took it out because I was so annoyed and just left it to dry next to the tank for months. Then I added it in again one day a few weeks ago and it’s been fine since. Good luck, hope yours clears up quick.

  5. Normal with new wood! It’s the bacterial bloom and is best left alone or scrubbed off. Boiling again will make it come back in my experience