I've also noticed a rather good size colony of RCS thriving in the Lilaepsis and stones. I added a few baby's months ago and watched as my Angelfish ate most of them before the even got to the plants. What's strange is that they are Fire Red whereas in my shrimp tanks the coloring isn't all that great. Environment must play a big part. The tank is also C02 injected. Still haven't seen the Amano's I added several weeks ago.