my suggestion will be as follows:
1 Nerite Snails
2 Otocinclus Catfish
3 pygmy cory
4 Amano Shrimp (will grow big)
5 Siamese Algae Eater (SAE) (will grow big and aggressive)
for option A, Red nose (rummy nose)will grow big and not much space to school not so nice for a small tank.
you can consider Amber tetra
for option B, both fish multiples easily unless you get only male fish.
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