My small golden hammer has bubbly looking tentacles. It has been this way for months. Everything else is happy, but not sure why this is happening. They don’t look like hammers any more, but rather large bubbles..
That could be one of two things, I think. Too little light, and it's swelling its tentacles to capture more light, or not enough flow. I'd wager one of those two things. I'd wager more on not getting enough light.
That's how mine were. They looked like actual hammers when I first got them. I've had this one for about 7 months. It's grown a little, but had the bubbles about the whole time :/