Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I also get long gooey strands in the Micros.
I do not get it when I add Excel to the mix.
Does not matter how much Excel, but if you add a lot, then that could count as your Excel dose for that day (That is how much I add- enough so I do not have to dose it separately).
I think it is a fungus. It does no harm to the tank, but I use an eyedropper sort of thing to measure it, and the goo is thick enough to cause problems with that.