Yep, I'd start with 70%. Treat the new water with prime but only dose TSS once you've got the ammonia below 1ppm and you've finished doing water changes. Make sure the new water is the same temperature and Ph as the tank water.Yes I can get some as soon as the pet store opens in about half an hour. I'll be able to start the water change when I get back. My wife is picking up some more 5gal buckets as we speak.
So more than 50% would be fine and treat with Prime and TSS? And do this back to back to back, as long as it takes for ammonia to go down.
Too many fish for stocking?
For stocking the danios need much cooler water than the angelfish.
Angelfish shouldn't be kept in groups of 3 as usually 2 will pair up and bully the other to death
The tetras and danios both need to be in groups of 6+
So no, not too many fish but bad stocking