They definitely only tolerate brackish.
I thought the same thing (there seems to be some debate about it on almost every forum I've visited) but I was reading an article a couple months back that was talking about 2 seperate strains of BBG's. The ones that were wild caught or only a couple of generations from wild that could not survive FW for any length of time, and the Aquarium bred strain that was so far removed from the wild strain and conditioned to FW for generations that they actually did better in fresh than in brackish. The 4 I have were kept in FW in the lfs, and that's what I put them into when I first got them (impulse buy)
) , once I did some research on them I intended to move to a BW set up but I never had the tank space to spare (too many impulse buys) so they have been living with my Dwarf puffers (the only tankmates the Dwarfs don't harrass) eever since, so far 1 year and they are healthy and active (for BBG's)....so IMO the jury is still out on on this one
Are all gobies brackish?
Can platys have salt in thier water?
Is epsom salt the same as aquarium salt (when I was keeping live brine shrimp, someone said it's the same thing, you just pay more for the name lol).
Nope, there are some beautiful FW species like the Peacock or Northern Spotted...although most FW species are commonly called Gudgeons.
Yep, I believe most livebearers prefer a little salt.
I don't think they ae the same
. I believe what you should be looking for to create a BW setup is Sea salt, sold in most lfs (local fish shops)
Do gobies have to be in groups, or can one be alright?
Do you think they would try to eat ghost shrimp? My puffer doesn't try to eat them, but they are pretty good at hiding. lol
I believe they are fine alone, most of the fighting Gobies do is for territory between the males.
Mine don't bother with the Ghost shrimp, but they love frozen brineshrimp.
My question is, can just a few (2-4) be kept in a small 1 or 2 gallon aquarium? I don't want to put them in with my other fish because I've read that they can be mean
I would advise aganist trying a 1-2 gal tank, only because they are supposed to be sensative to water conditions and the small tank can go sour so quickly that you might lose them suddenly.
I don't find them to be mean at all, they just look mean (like a little Bulldog). I f the other fish leave them alone they mind their own business...they remind me of a grouchy old man, always scowling, keep to themselves, and will chase you if you bug them enough, but not far and only to make you go away.
. It had to be smaller than an inch. I have wanted to get one for the longest time, but I'm heard they can be sort of mean. I was also wondering if anyone ever had any luck getting them to eat anything besides live food. THANKS!! 
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