Flower Pot and Cup coral issues!!

[kien]

I currently have 3 gonioporas, a purple, a red and a peach. My pruple one I've had the longest, coming up on 3 years now I think.



It has not really grown or declined since I got it. It just remains static. Strangely it can go from nice and puffy like in that top picture, to all shriveled and retracted in this picture..



.. and remain this way for days at a time.

I got a red one from zoeElite a few months ago. It was a baseball sized goni. It has now encrusted over and onto the rock that I mounted it onto and continues to spread.

My latest goni I got a month ago so hard to say how well this one will do. I do not feed my gonis anyting because their feeding tentacles aren't sticky so even if I sprayed them with food like I do with my other LPS, the food doesn't get trapped. I am certainly no expert but it almost seems to me like they filter feed.