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A 20 long is to small for a marine Betta but the clowns would be fine.
I mean they get 8 inches long and like caves to hind in. I honestly wouldn't do it but that's just me.
A goby plus shrimp would be really cool for that size tank. Like a watchmen and pistol shrimp.
The yellow watchmen goby and tiger pistol shrimp are popular and have been hardy in my experience.