My cycle lasted 4 weeks, and then i added fish, so I'm not gonna hassle you about that. A cleaner shrimp and two fish added within a week is a little quick, though. Usually 1 fish, spaced 1-2 weeks apart is recommended at the start. And I added an anemone before 6 months, and it has gained a lot of color and has been doing great. But my water is very stable and I've never had an issue with hair algae or cyano
(fingers crossed that I never do).
Anemones are carnivores. If the fish is slow enough, and the nem is hungry, it'll have a snack. I believe some nems are more likely than others to do this. What kind of nem do you have?