These are tiny!!! Ghost Shrimp, sometimes known as Skeleton Shrimp, are usually seen individually or with another one or two. They are very hard to spot, or even see, when you find them, as they are max out around 10mm long.
I found a Sea Whip with 100s of them, looking like ants or some weird animation. Is think there are juveniles and adults, and though they look like they are fighting, I’m sure there is another explanation..