that is a very good tank those eclipse systems. The inch per gallon rule is something i sort of follow, im more of a surface area and filtration guy, also the inch per gallon works only for long short fish and with tall fish, you need to calculate the mass of the fish.
How about a school of 6 neon tetras, 4 pygmy cories and possibly one or 2 male guppies? This is following the 1 inch per gallon rule. Using some planted tank gravel and get some hardy plants since that light permits the addition of plants but only hardy low light plants.
If you are a strong animal rights believer you can make the tank a betta tank (i find people who keep bettas in 10 gallon + tanks very nice since most of the time people buy them in 1/16 of a quart and expect them to live.) Also in a tank that big for 1 betta it will really stretch out its fins and swim very happily which most people love bettas for. Theres also a chance you can have a dwarf puffer species tank, there more of a challenge to take care of but can be fun little things to take care of. http://www.dwarfpuffers.com/
theres a website dedicated to dwarf puffers.