Things that crawl out of our rock

The 125 gallon tank (the future Bright Reef) has been cycling mildly, with the ammonia never going above 0.50 and the nitrites never exceeding 0,25 ppm. Yesterday the ammonia was barely measurable, and today we have none. Today the nitrite level is somewhere between 0,25 and 0 ppm, with nitrates at 5 ppm.
But last night, I found a snail, a tiny and very busy snail, zigzagging his way across the glass. I moved the rock around yesterday, fastening some together with zip ties, and that stirred ...

We found a new invert in Little Bright Reef last night. On the very top arch, situated so that you could only see it when viewing from slightly higher than the top of the tank and from the left corner, is a pale red feather duster worm with a white tube. At first I was afraid I was seeing a small aptasia, but when I moved to get a better view, it sucked itself back into the tube and I realized what it was. Very striking, the red tentacles against the white tube and the lavender coraline. Of course ...