hi mark,
not a prob, ...quarantine your new angel fish in a bucket[medicate or 2-3ppm salt]...then swap places with the big angel into the bucket[normal clean water] for a day or two.
this makes the older bigger angel the new boy in the tank.
any quarrel later on will just be adjustment of the pecking order...
angels won't bother the red rainbows from xp.
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