I'd think if it wanted more light it would move
Same goes for flow
Try feeding it some silverside - maybe a quarter or half piece to start with
If it eats it, try feeding it once a week until it comes around, then slowly dial it back to once or twice a month
And if you can't get some right away, try some Mysis until you can go shopping
My RBTAs get a quarter or half once a month, depending on their size
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