if you're going all invert, you could try this:
10 ghost shrimp
6-7 amano shrimp
12-14 cherry shrimp
1 dwarf crayfish
1 brig apple snail
1 columibian ramshorn
1 bamboo/wood shrimp
this may seem like a bit much, but inverts produce far less bioload then fish, and if it's planted you should be fine.