If your coral does not like the condition it is in, it just die. For an anemone, if it does not like the condition it is in, it move. Large anemone can cause a lot of damages moving. They often moving they often seek higher flow and move into the PH or over flow. When they think the condition is really bad, they just let go and flow a way, right into the PH or overflow.
Puree anemone can cause a lot of damage. The nematocysts of the anemone will be release to the water of the tank and can kill all the fishes in the tank.
If you know what you are doing, and start the tank with great LR and the tank is stable right away, you can put the anemone in the tank but as a new reefer, and not having really good LR, I recommend not put one in until you know how to keep your tank running smoothly and keep it stable. How long is that? It is all different for different situation.
I recently started a 65 gal tank the end of July 2020. I started this tank with sand from the beach of the Gulf of Mexico and LR I put into the Corpus Christi Bay for a few months. It only take a few hours to get the sand and the rock from the Ocean into my tank and the tank did not cycle, and teaming with life. After a week, the tank was staple with minor died off. In this situation, I put two S. giganea into this tank right away, they are doing great. Here is the few picture of the anemone when I first put them into my tank and a recent video of the tank.
Due to their large size, and their ability to move around and cause damage, and their demand for generally stable, good condition with good water movement and high light (specific condition varies depends of the species of the anemone) it is generally recommend that host anemones should not be keep by novice reef keepers.
This is definitely a case of "do as I said" not "do as I do". Picture of tank at about about 2 weeks old, but very far from a normal reef tank:
Recent video of tank at about 3 months. There are two Green Gigantea in that tank, but the second one is behind the rock and cannot be seen from the front.