Possibly starting first ever small FOWLR SW tank and looking for info

[CGY_Betta_Guy]

Thanks for the ID... someone else also confirms that these are indeed the pest anemone. I will need to figure out a way to get rid of this guy... its suggested that peppermint shrimp can help with eating them?

Good to know about the filter foam. I was just under the assumption that its a good idea to have the foam there to help in mechanical filtration like it is in a fresh water tank. Guessing removal of the dish scrubbies is also a good idea for the same reason. Is a skimmer the primary way of eliminating organics from the water?