I have that tank myself. (See sig.) Ive gone for 9 fish all of which only grow to an inch / inch and a half in size using the 1inch of fish (excluding caudel fin) per US gallon rule. The 10 gal UK Via aqua 380 is 45litres or 11.89 US gallons, so I'm slightly understocked if anything.
Id always thought that the surface area stocking rule was 2.5cm (1 inch) of fish per 75 sq cm. The surface area of the Via Aqua 380 is 24.5cm x 37cm = 906.5 sq cm. Divide that by the 75 sg cm and you get 12.09.
The upshot of all this is that you should go for no more that 12inches of fish in thistank, 11 would be safer IMO. Your calculations need to be based on the eventual adult size of the fish you intend to get.
Your White cloud minnows will get to around 1.5 inches each
Honey Gouramis reach around 2.5 inches
Sparkling Gourami 1.5 inches
Schwartz's corys 2.5 inches
So your original list of fish comes to around 14inches which is a few to many
I have 5 Harlequin Rasboras
and 4 pygmaeus corys in mine incidently
Via Aqua do do a 15 gallon tank
http
/www.theaquariumshop.co.uk/aqua-gall...rium-o-173.html
I like mine because the rounded corners at the front allow you to see things more clearly
Hope that's helpful