Again, though...white clouds are schooling fish; there is not room for a school of fish in that tank.
There are a lot of threads on what fits into a small tank on AC. It is very limited. Betta, single dwarf honey gourami, maybe mosquito fish, *maybe* a couple microrasboras, shrimp, dwarf frogs, guppies (single sex)...schooling fish really are not generally suited for small tanks.
And the pleco, as mentioned, is just way too territorial and large for such a tank.
Not only are bettas some of the most beautiful, cheap, and readily available fish out there, they are fairly undemanding (no excuse not to take care of them properly, though) and have some of the most "person"ality of fish out there. They will recognize their owner and beg for food.