I'm not surprised you had a slight ammonia spike, always a risk when you start swapping things around. How was the established tank's live rock moved? Was it out of water long at all? That can cause some spikes. Also like mentioned, did you reuse your sand? If you didnt wash it that also could have caused some flucutations.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.