Rbp are very skiddish when younger and even older, but they seem to mellow out a tad when they become adults, approach the tank slowly, make sure you don't have Sharp edges on decor, glass banging is normal when keeping fish in tanks, I've noticed black water/lower lite and lower temps (74-78) can help with their skittish behavior.
I always walk up to my tank slowly and I never make fast moves.
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