OK current cycled 10g specs- 100w heater with adjustable thermostat, 5-15g whisper pump,standard lighting (led moonlight in future plans), 10lbs black gravel.
Plants - Anubis on lava rock, zealot sword, some floating anacharis . (Plan to add Java moss and possible Java fern)
Currently the tank is home to a moderately large pond snail population, part of my build is to get a sustainable PS population and to control its growth with assassin snails. I personally feel PS are good janitors when there population is controlled, which brings us to stocking ideas which I am open to and want some different opinions.... my current idea ( subject to change) is as follows -
2-3 sparkling gourami (one and a half inch Adult size)
3-5 Pygmy Cory (1/2inch adult size)
1-2 assassin snails
sustained pond snail population

Now please GIVE ME SOME INPUT!! :-)

Also would It hurt my cycle if I added 5lbs of sand ontop of my gravel

Seems like an okay plan, although not sure on the accuracy of size of fish you posted. Is the tank already cycled?

Sure is, I think I might be a half inch off on The size of the fish if I end up with females. Will the Cory's be OK with gravel or should I add afew lbs of sand?

Mine do fine in gravel.

Think a group of 3 will be OK or should I go for more

They will always like the sand better but should do fine with gravel as long as it is not sharp. Again, they might do okay in a group of 3 but will enjoy the company of more.

How is the tank filtered? Does the tank have a filter, or is it just an air pump and plants? I don't think 3 sparkling gourami and 5 Pygmy Cory would be overstocked in a well filtered tank but depending on your filtering it might be better to keep stock lower than that.