70 liter is like 15g???
You have more then enough fish already
IMO...
How long has tank been set up with fish in it?
Some of your fish would like more of their own(rasboras),and some shouldn't be there in the numbers you have ,or with some of the other fish(multiple gouramis)
IMO you will end up with only one gourami...
Have you ever checked out ;
AqAdvisor - Intelligent Freshwater Tropical Fish Aquarium Stocking Calculator and Aquarium Tank/Filter Advisor
Input your info and see what they say...
Most here say they err on safe side but a warning is a warning...
Oh yea...WELCOME TO AA!