"Does anyone here have any luck feeding this large polyped type?"
I have, but the food had to be very very tiny.
I had this one for about 8 years.
It was before digital cameras so the quality of the pic stinks. Sorry.
I started out feeding it a home made concoction. We didn't have all the cool foods we have today. My recipe would change each time I made it. I'd use frozen fish bait like squid, shrimp, mullet, or what ever I could get. I'd even throw one of my daughters Flintstones vitamins in the blinder. (In hind sight, probably not a good idea:rolleye1
I'd blend it all up real fine then freeze it. At feeding time, I'd thaw a small portion and dilute it. Then suck it up with a turkey baster and target feed the Goni. It ate well. In fact, if I didn't feed for 3 or 4 days, it would start to withdraw.
Paul, you may remember this. Back in the day, they had a product like those white solid blocks used to feed fresh water fish when you're away. Only this was bigger and designed (or marketed) as filter feeder food. You could just toss it behind the rocks and it would dissolve. Before taking a week and a half trip to the Keys, I got nervous about not being able to feed the Goni for that long. I didn't figure this product would make any real difference, but I gave it a shot. I just knew my Goni would be on deaths door when I got home. To my surprise, it looked great when I got home. After that, I kept one of those blocks behind the rocks. I still target fed it from time to time, but nothing like I was before. When the block was almost dissolved away, the Goni would start to withdraw. I'd replace the block and it would bounce back.
The coral grew to the size of half a basketball, and dropped "Goniophytes" (term borrowed from John Kelly) on a regular basis. For me, feeding made all the difference in the world. It had to be VERY tiny food though.