Yup, this rhizo is in the worst condition I've ever seen it in...also in the worst condition amongst all my other rhizos. The rest of my rhizos are still doing fine.
If you want your rhizo to have tentacles that extend to 6 inches, do what I did last time...
finely chopped silver fish, prawn and mussels mixed with 5 in one coral food and seachem reef plus. Leave it for 30 mins.
After that, take your rhizo out and place it in a tupperware filled with your tank water. use a syringe to feed the mixture to your rhizo. Let your rhizo feed for 30-60 mins. If your rhizo feeds, what you will see is that the flesh will bloat up a LOT. I have seen mine bloat more than 1 inch above the skeleton. Once this happens, put it back into your aquarium and you can see how long the tentacles will extend.
Do this every night for a week and you will see the tentacles extend a LOT after that. Do it for a month and you might be able to see the tentacles extend to 6 inches...