Welcome to the anemone world.
1. All clownfish will not host to all anemones. As instinct they will usually host each other but not necessarily. It may just take time.
2. Anemones will take food when they are ready. Transitioning into a new tank can stress these animals for a few days. I feed mine white fish, scallops, shrimp chunks etc. I grind mine in mixer into chunks. Feed it to everything. Hand feed it and if it ready to eat it will pull it out of your hand.
3. Healthy water. Strong lighting.
4. You will find it will move where it wants like a snail. So don't try to put it one space and keep it there.