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Brine will usually get them to open up
So you think if i just put a piece of shrimp on it, it might open?
Yes that should help
Also they prefer lower light so put them in shade if possible
They need to be fed manually. Unlike many corals they get no nourishment from lighting. What are your water perimeters? Is it in a low light low flow area? When you feed turn off all pumps. Make a mixture of brine shrimp, mysis, liguid and powder foods. The last two will help get the scent of food in the water column. Squirt some of it around the dendro. It should respond to the smell of the food. When it comes out squirt more onto the tentacles. Dendro need to be fed a few times a week. Unlike their cousins the sun coral. Dendros come out all times of day.
I have found that flow makes a big difference, under moderate flow, mine is open almost all the time, under low flow would open only when feeding time.