The following link should answer several of your questions but I'll answer what I can of what it doesn't below:
https://www.petshrimp.com/set-up-a-supe ... tructions/
Kneedles wrote:Anyone know how to go about opening one of these without hurting the shrimp?
A number of members here have done this so I'll have to defer to their expertise in the matter.
Also I know I need certain amounts of things in my tank but how do I test like the salinity and amonia levels and etc.?
If you put in half the amount recommended for ocean salinity on the package then you shouldn't need to test the salinity, but if you want to be sure then you just need to buy a hydrometer. They're pretty cheap at pet supply stores.
As for testing for ammonia, the most accurate way is to buy a liquid test kit (again, sold in most pet supply stores), but in general if you follow the instructions given on the site you shouldn't really need to test unless you run into problems. I did though just to be certain.
And will the shrimp on this site get along okay with the ones in my ecosphere?
These shrimp don't really fight, though they may chase each other a bit over food, so there shouldn't be any real problems.
Also should I order the snails from this website or will other species of saltwater snails be okay?
Best to get snails adapted to brackish water like Mustafa's on the site, many saltwater snails may not survive in the lower salinity of a supershrimp tank.
Also what products do people use in their tanks to get the saltines and the Calcium and stuff?
Nature's Ocean is the most convenient salt mix where I am, but most any brand of salt mix intended for saltwater aquariums should work fine provided you make sure to add half the recommended amount. As for calcium there are many way to make sure there is always enough. I got a big piece of limestone holey rock in my tank, but some aragonite sand works just as well. Even egg shells can work.