Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I have used the plastic covered twist-ties, but never in such quantity. Eventually (usually sooner, not later) the plastic covering comes off and the metal is exposed. It rusts. If I have just one of these in a tank I do not worry about it. As many as you are using might be a problem.
Could you do this:
Find some twigs and zip-tie them to the branch.
You could also drill a small hole in the main branch and super glue the twigs into place.
You do not need anywhere near as many. The moss grows very dense and will fill in between the branches, even if the branches are several inches apart.