I have heard alot about the soda bottle, I may give that a try. Currently my setup is mostly just live rock, I bought some zoa's and they worked out great so far, I am just excited just to have anything saltwater, I have kept cichlids for about 8 years now.
I don't know if it means anything to you on what type or size the mantis is, but I caught a quick glimpse of him, and it had purple eyes, and a dark purple body, probably and inch to inch and a half long, but it was in the shadows, sitting there taunting me. I saw something balled up on the most recent rock I added, I thought it was a worm of some sort. Guess not, I also noticed one of my peppermints missing, and quite a few hermit shells now empty.