Congrats on the new (to you) tank! Yes, it's very exciting, we are excited for you.

Your plants will be good for the cycle (often they carry in good bacteria with them) and fish setup (help oxigenating the water and using nutrients to lessen algae growth).
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I can't remember the scientific name for the dwarf neon rainbowfish,
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Dwarf Neon Rainbow is Melanotaenia praecox.
Often they are just called praecox (pronounced "pray-kox")
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Is there room to also have giant danios or would that be too much?
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You probably have room, but I believe they can get rather aggressive, something you said you would like to avoid.
The zebra danio can get that way too, but with 8 of them, they may only chase each other.
If you want some action but non aggressive, instead of giant danio, take a look at congo tetra (Phenacogrammus interruptus).
4 to 6 would fit in your tank.
For a splash of color, red swordtails would look nice (1 male/ 2 female).
You may end up with babies, tho, but that's kind of fun.
As for the violet goby, I've read they are actually brackish water fish, and can be difficult to feed.
They can be kept in fresh water, but it will shorten their live expectancy.
What is it you like about them? Maybe we can suggest something that would
be similar with out the hassles of it getting so large and special water needs.
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6 Cory Cats
5 dwarf neon rainbows (though, I'm not sure if Petsmart has those)
8 zebra danios
1 apple snail
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and
either
3 red swords (1m/2f)
or
4 to 6 congo tetra
would be fish-a-plenty for your 55G. Keep up your weekly partial water changes.

If you can't find Praecox, 6 congo tetra
and 3 swords would be nice.
If you dropped the 8 zebra danios (kind of nippy) you could have 1 angel for a center piece.
Tons of options! Check out what PetSmart has and write them down.
Let us know what you find and we can offer even more suggestions.
btw, maybe I missed something, but how are you cycling your new tank? With the danios?
http://www.fishlore.com/NitrogenCycle.htm
alicem