Short Answer: Yes. Bioload should be fine. They also shouldn't bother the existing tank mates....in theory. They look very cool together schooling and shoaling.
Long Answer: Mentally prepare yourself for disappearing chromis. Whether by aggression amongst themselves, injury, or disease. Long term; from your initial 12, you'll lose approx 4-6. It's what they do. The good news is....they are relatively affordable that you can replace mysteriously disappearing ones if necessary.
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