Hello Aceigga and Welcome to Fish Lore.
It doesn't sound like your tank is cycled or for some reason you're going through a mini cycle. I suggest increasing your water changes to 30 to 50% daily and continue using the ammolock to detox the ammonia until your readings are 0 ammonia, 0 nitrites and under 20 nitrates. Even though you add the ammolock you may still get readings for ammonia but it's actually ammonium which is less toxic. This will help to keep your fish safe for the 24 hours until it's time for your next water change.
How did you cycle the tank? I see you are aware of the
nitrogen cycle. Too, you could take some media from your established tank (don't take out so much it throws your established tank into a cycle as well) and place it in the tank with the issues. This will help to establish your tank a lot quicker by "seeding" it.
Note: if you've set up both of your tanks at the same time I don't know that I would remove any filter media just yet and finish cycling your tank with the water changes.
Best of luck.
Ken