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^^I agree with this and good idea sirMost wouldnt recommend an anemone until much later on, around 9-12 months so the tank is biologically stable. Tank specs will help as well but that rock and sand you put in looks younger than 5 months, it looks brand new so it will take a while for bacteria to colonize and then become a mature stable tank.
I have had luck with using pns pro bio and yellow sno in conjunction with fritzyme 9 to help increase bacterial populations quickly, but the best thing you could get is just a bunch of rock or bio media from A TRUSTED REEFER, either from this forum just ask in want to buy WTB section or a reefer with a tank you can trust that you already know. Not your local fish store. Check out their tank and talk to them first about what pests they have in their tank so you know what might come with the media/rocks