Blue cloves are the fuzzy thing. He is talking about putting some Zoax on the rock to spread and the cloves don't seem to be doing much.
It is pretty cool over on this other site as every once in a while someone will start a "PICO TANK CONTEST" or whatever. This tank is part of a 10 gallon contest going on. Never started byt the site owners but by the members themselves.
But yes, this is one of my favorite so far, just a work of art.