I think I bought a frogspawn a couple of months ago and put it into my tank next to my hammer coral, the frogspawn has now grown at a significantly quicker rate and is irrating the hammer. Is this known to be invasive?
the frogspawn is happy and thriving so leave it where it is, move the hammer to somewhere else in the tank if you have space and let it settle down, you should see more extension from the hammer soon.
I would also recommend moving the hammer and leaving the frogspawn where it is. I have also noticed in my systems that a frogspawn appears hardier than any of the hammers I have tried.