I agree, find an established anemone to buy. It will be easiest to acclimate. Sounds like you’ve got one in sight.
look at where they come from, not opinions.
They come from tidal areas, high flow and white light.
Here’s mine. I just moved them 2 months ago. Most of them when acclimated, and HAPPY, can get 6” long tents. They do best with white lights, around 2000 par will make them happiest. Good luck lol. Most fixtures can’t produce this. You will need supplemental light to give gigs what they want, IF, you try to give them best health. They can live with less, but won’t be glory living. That’s why it’s hard to see any in their glory. Orion N has a green that’s getting what it needs. Hard to find. Orion has 5K light added to that green he shows. Minh has it figured out. They get long tents when truly happy. Most of mine have had tents that long, but is possible to keep them with blue lights, but tent length shows they get what they need. Mine are short tents in these pics, they don’t get what they need to thrive, only what they need to live. Look at blue light pics, it’s only what they get to survive, not to thrive. To keep them long term and thrive, they need white light and high flow. There’s a difference between surviving and thriving.
My KH is around 7-8. I struggle to get it above 8 right now. They do best at 10 in my system, it gives me room for error. If I get to keep KH at 10 for a long time, with flow and light, the tents get very long. KH to my eyes, is most critical, the fastest parameter to affect them. Here’s mine today.