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I got my shipment on the 22nd, and the things that are coming out are just fantastic!!! My ammonia is now 0 after a brief spike to .25, my nitrites are now 0 and nitrates between 0 and 5. Here is the new mystery critter:
No idea on your first pic/first post, the second looks like maybe some type of hydroid, the third one looks like cluster tunicates and the last one is a tube coral, cladocora sp.