My bantie brooder is pretty quiet, but my standards are very noisy! They're all healthy, doing great, and VERY active so I'm not worried. At night when everyone's crops are full, they tuck themselves in, and I turn the light out, they quiet down quickly. During the day, they're quarterbacking with food (or an interesting shaving), chest bumping, practicing flying, dust bathing, surveying their domain from atop the waterer (I need to set up the nipples), pecking at the sides of the brooder, tossing shavings everywhere scratching through them...all at once since there's probably 40 in there...so, very noisy.
Sounds EXACTLY like what's happening here