I agree except 5g is not enough. I would do a 50% water change to drop those numbers.
I would do a 5 gallon water change and mix more up for another one in a few days. Take everything slow, only bad things happen fast in this hobby. Make sure you use RODI water and if you cant get that use distilled until you can afford a unit. A 29 is way to small for a yellow tang and the mandarin will probably eat thru your copepod population quickly. Hopefully it is eating frozen brine or mysis. Take plenty of time to read. If your wondering about something search it here more than likely someone has had the same problem. The ammonia is the most dangerous of the 4 you posted so get that to 0 asap. hope I helped


