I think I bought a not so good anemone because it hasn't attached to the wrong or moved around in 3 weeks. I think his foot is bad. It's a sebae anemone and I know it's hard to keep
Age of tank? Lighting? Parameters?
It's probably not an unhealthy anemone, it's probably just not used to your tank yet or doesn't like something about it. maybe too much light too soon? How are you acclimating it to the light?
Turn it down and slowly ramp it up over a period of weeks. Those LEDs are much more potent than they are used to.