I don't think 4 teaspoons of salt will hurt your plants, it's not really much salt, but could make a difference as far as decreasing nitrite toxicity. Sorry, I mostly saw anacharis which is salt tolerant to a degree. These pet stores use salt in their tanks (Petsmart and Petco both do) so if they were in the tanks with the fish they ought to be fine at this low salinity.
A molly is really going to grow too big for this tank, but guppies can do ok in 10 gallons - fancy guppies tend to be rather flimsy anyway, and are hardened up by making their tank slightly brackish.
You can read more about it here:
http://www.tropicalfishfinder.co.uk/article_detail.asp?id=61
http://homepage.mac.com/nmonks/Projects/FAQ/2d.html
The best common plants for your low light setup would be things like Java fern, Java moss, Anubias barteri and Cryptocoryne wendtii. See if you have any local fish stores (mom and pop places) rather than Petsmart and Petco, their prices are way too high on most of their plants - not to mention the employees don't usually know much about them.
Various edits...sorry! Brain not working right today
A molly is really going to grow too big for this tank, but guppies can do ok in 10 gallons - fancy guppies tend to be rather flimsy anyway, and are hardened up by making their tank slightly brackish.
You can read more about it here:
http://www.tropicalfishfinder.co.uk/article_detail.asp?id=61
http://homepage.mac.com/nmonks/Projects/FAQ/2d.html
The best common plants for your low light setup would be things like Java fern, Java moss, Anubias barteri and Cryptocoryne wendtii. See if you have any local fish stores (mom and pop places) rather than Petsmart and Petco, their prices are way too high on most of their plants - not to mention the employees don't usually know much about them.
Various edits...sorry! Brain not working right today