Snake head isn't compatible species.
Use only one of this Barb (Barbonymus schwanenfeldii):
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And another one of this Albino Barb:
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Too many Barbs and they'll form a pack and eat everything or even smacking each other, leaving GATF alone so use only ONE of each.
Bala Shark won't grow faster though. Mine still sits at 5" while my GATF grew. It got bit from time to time but nothing serious.