Master kit is the for SURE way to go. As far as Bumble bee gobies, they are truly brackish fish, but commercial retailers just throw them in with everything else. If you get a brackish one, you can convert it dong a slow freshwater drip.
let it go at least a week or two if you can and give it time you dont do it right now and it will just be a constant battle to get it right and things will always wack out for instance your foggy water ive never had a tank thats cycling go foggy
best of luck