Nothing spawn in the nether anymore except Magma Cubes in the magma slime islands. I can force things to spawn in the nether fortresses but everything else is empty. How can I adjust the spawn rate on the magma slime islands or just turn it off? Not even pigmen spawn anymore.

If i use a command to kill all magma cubes (/kill @e[type=magma_cube]) then it wipes them all but they spawn faster than i can kill them all

1.5.4 config files with 1.6.0 server dont work :P my bad