I am seeing a lot of small rectangle dark red dots growing on my rocks. They are about 2mm x 1mm, very small, and flat. I can blow them off with a turkey baster. I see a few on the glass. They look like some form of plant life, not a worm or creature. The color is a dark maroon red, although with bright light behind them I can see mor foa rusty orange color. Any ideas to help get me pointed in the right direction?