Hi, a couple months ago I bought a feather duster from LFS
and it was stuck to this dead sponge thing.
Anyway, my little pair of zos that I got for free kept flying around in the current so I just stuffed them into the dead sponge thing where they began to thrive and grow a 3rd zo.
On the sponge thing, there was this jet black, smooth mat of algae like stuff. It didn't seem to bother the zos.
Well after a while the jet black stuff started to gradually (in a creeping fashion) turn a deep purple, and everywhere that the zo touched it, it turned the edge of the zo yellow like it got "burnt" and eventually the zos started to recede and not open up.
Well I finally pulled the shrunk up (now only 2) zos out of this purple mess and am wondering if this is some kind of cyano
or what? You can "peel" this stuff off of the dead sponge thing quite easily.
Here is a pic.