They can grow pretty fast. They can also self-frag, if the conditions are right and you give them enough time.
November 2020:
The circled coral, right in the middle, is what it looked like when I first put it in the tank 5 years ago. Maybe 2-3" across.
September 2025:
And that's what it's become in five years. The big coral in the mid-top is the original, and is currently about 10" across. There are two others just as big as it (possibly bigger), plus about 6 others that are about 6" across, plus about 10 more that are still little nubs, some of which you can't see because they're blocked by other toadstools. All of them came from the original.
November 2020:
The circled coral, right in the middle, is what it looked like when I first put it in the tank 5 years ago. Maybe 2-3" across.
September 2025:
And that's what it's become in five years. The big coral in the mid-top is the original, and is currently about 10" across. There are two others just as big as it (possibly bigger), plus about 6 others that are about 6" across, plus about 10 more that are still little nubs, some of which you can't see because they're blocked by other toadstools. All of them came from the original.



