I guess your tank is no longer a FOWLR
. It's more than just fish.
+1 to Convict's suggestion. It won't matter where you place anemones. They will move themselves into the right situation in your tank. Bubbles are tough. I've had them stay at the bottom of tanks in the light and I've had them hang in the corners, up near the top of the tank, in the dimly lit areas and stay there for weeks before "hitting the road". again Ther's no telling what they will do. Just make sure that you place your new one away from your old one so it has time to adjust without getting stung from the other anemone.
Hope this helps