So I found this little guy in my tank tonight. I have had this tank set up for one week. I already have found brittle stars, black sea urchins, coral cups, tube coral, sponges, spaghetti worms, and
aiptasia. Now I see this little white thing go scurrying across the sand. I got pictures of him right before he went and hid. After doing my research online, I believe he was a Cirolanid Isopod.

I removed the lid in anticipation of him coming back out. As soon as I seen him again, I scooped him out with a net and flushed him.

Am I right on this one? He sure fits the pictures I've seen to a T. How likely is it that there is more in the tank? I only bought 8 1/2 pounds of
live rock, and the tank is only 5 gallons.