Court Jester (Rainford) Goby not eating

[Kyton66]

Hi,
Well, I've tried feeding a Court Jester goby but without luck.
I've had the fish for over a month and it is just getting skinnier. I tried frozen cyclopese again tonight, it sucked one in, spit it out and didn't eat another. Frozen Mysis shrimp and brine shrimp are also not being accepted. As far as I can tell it is sifting the sand which really doesn't have much life in it. I've left algae on the glass which it is pecking at. I put in a piece of Cheato algae with amphipods on it in the tank, so hopefully the goby will get a few snacks. I've removed the other fish from the small tank so no competitors for pods. Also I've been trying to buy freshwater aquatic black California worms and even called the farm, but they won't be shipping for many weeks. Anyway I hope someone can offer advice on how to care for this hungry little guy.

Thanks