Cycling of a tank

Thanks coral reefer, sent some karma your way.

 

Also called the LFS where I got the sand sifting star and they are going to do a trade for me, they did 3 green chromis damsels. Are these better than the blue ones? They said these were less aggressive.

I only have 2 peppermint shrimp(had some aptasia at first), a small colony of yellow polpys, one emerald green crab, three blue legged hermits, various species of turbo snails, lots and lots of little bugs(amphipods I guess) and some strange looking sea slugs. I want to take a picture of the slugs and see if someone here can identify them for me.