Okie..My turn to step in liao.....What a nasty mess you got there, Ernie...
Actually for a 30L tank, use live rock to start the cycle is more than enough, they are enough die-off to kick-start the nitrogen cycle. You must have used a giant tiger prawn for your case ......
First of all, your ammonia is way off the scale. Do a massive or 100% water change as soon as possible and don't move or wash the LR in fresh water. Remove all dead crabs, worms and stars.
Refill with new mix salt water, add power head and an airstone, of cause must connect to an air-pump hor ... Let the tank cycle from here for 1 day.
Add half a tea spoon (not table spoon hor) of common table white sugar(your kopi sugar) the 2nd day. The water should get cloudy by the 4th day as the baterial bloom should have occurred. Let the water clear by itself, maybe 2-3 day, and remove the airstone. Check your NH4, NO2, ignore NO3 for now as anaerobic will not have established.
Do minor water change and wait every 3-4days after the last stage ....
Don't scare scare okie... be patience ...