I was successful on my first attempt breeding Dwarf Gouramis .I followed standard instructions most gave on the internet.No sand needed you will want to clean up the bottom of uneaten food bare bottom or slate..Put 8 inches of water 80sh temp and add Hornwart he will will build another nest.Feed the females plenty of frozen brine shrimp 3 times a day double servings for 3 days at least if they get plump they have eggs and will readily spawn when you add them.The male will look aggressive towards them but they will follow him to the nest after a while..Seed a sponge filter for at least 7 days to use in the breeding tank.