I added three new fish to my tank a week ago. A yellow wrasse, a firefish goby, and an additional clownfish. The new clownfish has been attempting to pair with the existing one, but ever since the additions the old clownfish will stick to a corner of the tank and swim up and down for a couple of hours at a time. I've seen that it could be doing so because of lack of oxygen, but I have water ripple on the surface and an in tank skimmer creating additional movement. Could it be stressed? Or maybe something else? If anyone needs to see my tank layout, it is in my old threads. I don't think its my rock layout though because that wasn't an issue before.