My aquarium has been running for almost 5 months now and I keep finding hitch hikers! Also some frag corals I got yesterday. I took two pics of each, one when I first put them in and a second an hour later. I'm very new with this and trying hard to learn to establish a perfect ecosystem for my small piece of ocean!!!! So thanks in advance to everyone. Can't wait til I can give advice to a newbie one day.