I just took a castle out of my tank and added a new piece of driftwood from the LFS. I don't know if I brought in a hitchhiker or if my ghost shrimp have been getting busy in the castle. There are currently only 2 ghost shrimp; before yesterday there were 3 for the past couple weeks. It was too quick to get a picture but I can describe its behavior and a brief description. It was tiny, like the size of a baby guppy but had a tale that folded under like a shrimp. It was about this long: (___) and about half that parenthesis in height. I didn't see any antennae but if it was a shrimp, maybe it was still too small to see them properly. It also appeared to have a segmented type body, not like a worm, more like a rolly-poly...but with a tail...and white. It wasn't clear, like an adult ghost shrimp. More of an off white. The thing that makes me think it wasn't a shrimp, was that it swam around the tank for several minutes going in and out of hiding. It didn't appear to have to boost off, but rather, just took off when it needed to and could change directions, or at least seemed like it did. It was faster than my Dwarf Gourami, but ultimately, it landed on the sponge around the filter right beside him and I'm about 95% positive that he ate it. This was the first time I've seen anything like that in here and it happened within 20 minutes of adding the new piece and rearranging the other stuff. The new drift wood has several crevices and holes that could have hidden it on the trip from the store, but the wood had been in a tank with a single large catfish of some kind (red tail, maybe) and nothing else that I'm aware of. I would think if it were shrimp then I would have been seeing more of them, unless Balthazar has been eating them before they could grow to this size and when I took the castle out, perhaps I had taken its last secure hiding place? Oh, and I had taken everything except one plant out to clean the gravel a bit and rearrange the new set up and I didn't see it darting around at that point.