Originally Posted by dyfin
[snip]I have been trying to determine if a branch from one of my parents trees would be acceptable. The tree is a Gimlet which is a kind of Eucalyptus.[snip]
At this point, it looks like you've got more experience with Eucalyptus than the rest of us! I just searched the thread for "eucalyptus," and this is the first mention of that tree. Your experiment with the Betta suggests that it may be safe, but, if it was me, I'd want to try another experiment, this time with more wood in the water, before deciding that it is OK. Please, let us know your results, if you do go ahead with this.