The stock sounds ok but if it were me I would choose either the neons or the diamond tetras and have just one larger school of them. Also I would not add the pleco until the tank is more mature. In other words you need to see the presence of algae.before adding the pleco so he has sufficient food to eat. Even then, you will need to suppliment his diet with algae wafers or fresh veggies such as zucchinni.. Other then that, I think this is a nice size tank to work with and will be a lot of fun to watch.
Marinemom
Marinemom