RainbowBubble Tip Anemone Got Bigger Overnight

[elm03]

Hi! So Sunday night (1-15-23) I brought home 2 rainbow bubble tip anemones from a local guy that was giving them away. The first day they were fine and just chilling which I was happy about obviously. This morning (1-17-23) when I checked on my tank they were absolute monsters. They are so huge and I want to make sure that’s a good thing that they puffed up and grew? I did give them some small mysis shrimp yesterday, could that be it?
It’s honestly probably nothing wrong, but it’s also so interesting.
Thank you!

 

[Cthulukelele]

They are aggressive growers, but they also take a few days to fully open. That's probably what happened in this case. They look happy and healthy.