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Not sure how to stop barnacles, but the white thing in the first pic (top left of pic) isn't a barnacle, it's a Scypha sponge. The "little trees" are foraminiferans - harmless.
No clue what the thing is in the star polyps, sorry!
And how do I stop barnacles?
you wont be able to keep these alive for long unless ya feed ungodly amounts of food !! which then would end up killing all due to poor water quality !!