upgrading 5g to 10g.

I have a 5 gallon tank in which all my plants are now starting to out grow it a bit so I decided on upgrading it to a 10 gallon. My manager at work wants the 5 gallon for his betta. I'm transferring everything over from the 5 to the 10, plants, sand and driftwood. The tank comes with a Quietflow 10, I can take the old filter from my quietflow 20 and put it into the new filter.

The fish that's going over are my betta and 4 pygmy cories. What else can I put into the tank with the betta and cories? I was thinking of either ember tetras, harlequin rasboras, or neon tetras.

I had bettas with my neons in my 20 Gallon and never had an issue with them. Plus the neons are an long, to big to be eaten. IT depends on the temperament of the betta itself. The one in the avatar I lost.... (I have two 5 gallons, one is mine with a HM Plakat Male and the other one is my grandma's tank) The one I have in my tank is with Pygmy Cories and he never harmed them at all. Pygmies are smaller then Neons.

The betta in the other 5 gallon is close in color, but with shorter and darker fins and a deep bright blue body. I only had one nasty betta out of all the bettas I've kept over the years.

In other words.... I might do Glo-lights in the 10g with the betta.