Rebelangel, Ok first off, On your PH tests, remove the lower reading PH test kit and don't use it, put it away as It's not doing you any good and could actually confuse you. Use the high range PH test as it's the one that is going to give you the most accurate reading. (One is for ph 7.0 and lower, the other is for PH range 7.0 and higher.You need to one for higher) Next, small water changes every day or two until you see the ammonia start dropping, the nitrite is probably going to jump up really high in the near future, don't freak out, just post the results and ride the storm out. Water changes are the only thing you can really do at that point and it's 100% natural cycling process. With nitrates climbing it sounds like "SOME" bacteria are still alive and working from the prior set-up this is actually a Yea!
not a ARG! :-(. Could be the plants, re-used rocks, even the old filter media. BUT it hasn't cycled to the pond as a whole. That's ok, the good thing is some ammonia and nitrites are breaking down so your really on the right track. Keep in mind you may go through a cloudy water or green water phase, this to is very common and quite normal. Best way to help the pond at this point. Reduce feeding to VERY VERY light feedings, only feed once Maybe twice a day or even skipping to every other day for a few weeks, and if you feed twice a day, cut those feedings in half size portions. seriously, the less food at a time the better. Keep checking the water and do water changes as needed to try and maintain .50 or lower readings of ammonia. Actually I would like to see the readings of ammonia stay where they are or lower.
Also, try and locate a KH kit. KH IMO is probably one of the most important things to monitor and adjust in a pond, It's simple to test and make the appropriate adjustments to the water and it helps maintain stability of the PH. In fact I rarely test my PH anymore. I do if the KH has dropped and I do when I run a quick check with a test strip as it's already there. BUT as long as I maintain a KH in the 80-150ppm range the PH is almost always 8.1-8.3 reading. The KH can swing from 80- to 200ppm when adding a buffer and it doesn't seem to effect the fish at all. However, let PH start swinging and it effects the fish AND it effects the toxicity of the ammonia.
BTW, Going back and re-reading the thread and watching the video, Don't add any fish for now. Let the pond settle down on it's own. The fish that are in there will do just fine, you know they are already healthy and disease free for the most part, don't take a chance and add something new that you may have to fight during the balancing process. Also wanted to tell you the pond is really looking nice, and I like you added depth for your fishy friends to help them stay warm in the winter and cooler in the summer!