My Koi is trying to Jump out of water, why?

[Lcc86]

Following the community's recommendation, I promptly acquired an additional 1ft x 1ft tank, which I have equipped with a hang-on-back filter. I transferred some bio-media from my current setup and relocated all four of my angelfish to this new tank. The water in the new tank consists of a combination of existing water from my old tank and freshly dechlorinated water, to which I have added 1 gram of nitrifying bacteria from Aquavitals

I really do not mean to be too critical but this is still way too small for any of the fish you currently have. I can see that you care and are trying to fix things but you either need to buy a much bigger tank or return the fish you have for more suitable fish. You cannot safely keep the fish you have in such small tanks, it will cause you constant problems trying to maintain the parameters and your fish will get ill and suffer.