11-19-2019, 05:45 AM
Join Date: Apr 2006
| | Re: Film on water surface
I would agree with you that the driftwood is leaching nutrients into the water. The film is a little ecosystem of bacteria and other microorganisms feeding off of those nutrients.
For years, I have heard so many instances of driftwood rotting and causing problems. Rocks which are inert (don't release organic compounds), IMHO, are a much better choice for planted aquaria. I'm not saying don't use driftwood, just that it is organic in nature, and because of that, it can cause problems.