I'm in agreement with the rest of the folks, 10g is too small for 2 angels (angels are a semi~aggressive anyways) when the decor/plants were rearranged, the territories were skewed, and tempers flared for a piece of the tank. Looks as if one may want to rule the entire thing though now, so a bigger tank is in order.
I've kept angels in 5g tanks (to grow out after breeding them), when dime sized, put them in a 10g, etc...etc... I've bred koi's, veils and half black angels.
I have them comfortably "adult sized" in a 30g "long" fully grown veil angels (30g long, makes for more "territory" of their own), and koi angels in the 46g bowfront quite happily.
I would recommend a 29g/30g long if that is the BIGGEST you can go. Bigger would be better, but my angels I've bred and grown out now are comfy in these tanks, provided that they have their own space, which is why I opted for the 30g long tank.
Bigger is better for these fish. I only recommended the LEAST, minimum tank size.
Good luck.
