Oh I misunderstood. Thought your LFS got them in. I got the super blue kerris (not as strong genetically) in very tiny, I was going to grow them out first, but they were the ones that didn't do well. I wouldn't trust small tetras with the angels though. Really don't want to rain on your parade, but i'd hate to see the money for them go wasted. That's especially since they are not used to smaller fish or the angels are in the tank first. I mean the angel is less likely to look at smaller fish as food if they grow up with them, but they should at least be added to the tank first (before the angels) and in a large school. Might help to move decor around a bit too when adding the kerris.ok. What do you mean at my LFS? This is an online store. I found bigger for a good deal but they went out of stock during this Covid thing. They sell in packs of 6 so I'd get 12.
12 sounds great If the other online store regularly gets them in, i'd wait for the ones that are a bit larger.
Nothing good happens quickly.