I’m not sure what exactly you’re asking so I’ll answer two different ways and hope it addresses what you’re looking for.
The condy anemone can generally grow 10-15 inches or so. I personally have never seen one that size in the home aquarium but just be aware. That said, you can have more than one in a tank. Not sure if that was your question or not.
If you’re looking for fish suggestions. The condy can be a fish eater, however I don’t think you’ll have too much to worry about with free swimming fish but rather fish that perch (such as gobies, blennies, hawkfish, etc.) beyond that, I’d just stay away from anything known to eat anemones (certain angels and butterflies mainly come to mind).
I hope this helps!