that is adorable! beautiful cat and chicks! when i had fish, i used to tease my cats by holding them in front of the tank. they'd watch them swim back and forth, back and forth. they never tried to get them. when we got the ducks as babies, they looked at them like prey, but they quickly learned otherwise. the ducks can now beat up the cats. our 11 year old dog was like their mother. she would follow them around, sleep with them, clean them and protect them. it was adorable. they can beat her up now too.
ETA: we don't have fish anymore, they ate each other. the last surviving got tumors on his head and died shortly there after. so their demise was not related to the cats.