I would not put them in a 55g tank. They are air breathers and need to get to the surface regularly or they will drown. I wouldn't put them in any tank that's more than a foot tall. They also shouldn't be with your tetras and danios for precisely the reason you stated, they won't get any food.
They are carnivores so they need stuff like frozen bloodworms. You can buy frog and tadpole pellets but I find the pellets are far too small and get lost in the gravel.
No, you don't need to add the snail or plant.
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Tina
Puffers:
Auriglobus silus x2
Colomesus asellus x1
Tetraodon travancoricus x1
Tetraodon biocellatus x2
Tetraodon nigroviridis x1
Tetraodon baileyi x2
Tetraodon lineatus x1
Tetraodon palembangensis x1
The greatness of a nation and its moral progress can be judged by the way in which its animals are treated. - Mohandas Gandhi
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