10 Gallon Species ?
 

I have a 10 gallon tank that im in the process of scaping. Sand substrate, rocks and a couple of amazon swords. What fish species would be best suited in that size tank ?
I have hard water and PH 7.4

Fishies for your 10 gallon tank w/ a 7.4 pH
 

Guppy
Platy
Swordtail
Harlequin Rasbora
Glowlight Danio
Zebra Danio
Pearl Danio
Dwarf Loach
Celestial Pearl Danio
Black Neon Tetra
Bloodfin Tetra
Salt and pepper cory
pygmy cory
dwarf cory
oto catfish
Dwarf Gourami
Siamese Fighting Fish
Mekong Bumblebee Goby
Nunus Bumblebee Goby
African Dwarf Frog

Okay...these are all fish in the freshwater section of the tropical fish profile tab here on TFK that are suitable for a 10 gallon tank. They are also suitable for the 7.4 pH you have...a couple of them might say up to 7.2 pH, but its close enough to include. I wrote them out this way so they would highlight so you can click from here to look up their info.
So, take a look at these, see if any spark your interest. I would be interested in knowing what you decided on.
Oh, and the African Dwarf Frog profile says a way lower pH than you have, but these guys can be kept in your pH level with little issue. I have had mine in a 6.5 pH (recommended 6.0 pH) for almost 2 years now...the first 1.5 years his pH was a little higher than 7, but since moving the pH is lower due to the water where we live now.
Anyways, good luck...and I would love to see pictures!