It could only mean one thing, your old Berlin skimmer was working. And you took it out, and replaced with a clean bio-wheel that didn't have any nitrification bacteria colony yet. Guess what, the fish and coral wastes had no where to go, and what you were seeing was another "new tank cycling".
I would put the skimmer back ASAP, even it's not the the best skimmer out there, but it's still working for you to export wastes and nutrient. I will remove the bio-wheel when the tank settles down since the bio-wheel can only convert ammonia to nitrate, and then stop there. You will have nitrate problem down the road if you don't remove it.
If you are increasing your bio-load in the future, upgrade the skimmer is an option, adding a canister filter with only carbon is another (carbon will remove dissolved organics just like a skimmer does, but the carbon must be changed at least monthly to avoid nitrate leak)