In over my head....

OK, so, my boyfriend got me a present.....
It's a cute little GSP from walmart. He doesn't seem to have any walmart diseases, but...I've never had a brackish fish. I have him in my little tank right now, a little 2 gallon that I had my favorite guppy in until she finally died recently of old age. This new GSP was to make me feel better, since I'd had the guppy so long.
Basically, the poor guy is in a 2 gallon tank that was cycled as a freshwater. I found my heater and put it back in, so at this point it's at around 76 degrees, much better than the 72 it was earlier. I put like .5 tsp of aquarium salt...just the API brand that they had at walmart....
I gave him some freezedried brine shrimp and some flakes.....
but I have nooo idea what to do!
He's going to have to deal with that tank for a while. I mean I have some 10 gallons, but they are at home, not school. Only one is still set up, and it has a beta in it with a few baby guppies who are permanently babies, lol.
I'm going to invest in the tank I set up for him, but the only chem sets I have are for freshwater, and I'm going to have to get all new substrate I guess....
I mean, I think they need like crushed coral or aragonite or something......

I know there's plenty of things online for me to read, but.... I need my hand held thru this. I've never done anything so complicated before. Like, my guppies never got their pH checked or anything, I don't know what I'm doing!

ugh...
i dunno, i've been reading articles on here and on the internet, and i realize it's going to take forever for me to set a new tank up.... Which I understand, I mean, it always takes a while, it's just... I have to *find* this stuff...

And I'm kind of worried about him. His tail is so clamped, and when he's not sitting directly below the heater, he just keeps swimming up and down like he's trying to escape thru the corner.

Is the tank warm enough for him, do you think? I just have like a whisper brand heater for 2-15 gallon tanks, and as far as I can tell, you can't adjust it, it just automatically senses when it needs to change. (which is cool, because I actually had to write a program to do that once)

*kills self*
i had a huge responce, and for some reason it didn't get posted.

I did breeze thru that article, and planned on reading it more in depth later.

I have a stick on thermometer, which says that it's 76 or a little higher

i dont have him brackish at all, i dont know where i can get that marine salt...i'll have to travel and i dont have time.

in walmart all the puffers were crowded into the beta cup full of aq. salt, and the sticker above them said they preferred 1 tsp of aq salt per 5 gals, so i bought some.

lol, i actually bought a ghost shrimp when i got him and have it in with him