stocking my tank

So, I have two tanks I need to stock and Id like ideas! I have a 10g and a 30g. I have Hard Water. My 10g is 10"L x 20"W x 12"H and my 30g is 30.25"L x 12.5"W x 18.75"H     I am an intermediate aquarist so feel free to have an open mind and don't be picky! Lay it all out there!