A 10 gallon tank is not really suitable for black phantoms -
http/www.seriouslyfish.com/species/hyphessobrycon-megalopterus/. That link basically say a 20 gallon tank.
Flame tetras -
http/www.seriouslyfish.com/species/hyphessobrycon-flammeus/- 15 Gallon tank
Gouramis - well one of the smaller gouramis being something like Honey Gouramis do best in something like a 15 gallon tank minimum,
http/www.seriouslyfish.com/species/trichogaster-chuna/
However, Guppies will be fine in a 10 gal. perhaps you may consider a Betta Splenden or microrasboras like Dwarf Rasboras, or perhaps Chilli Rasboras would be nice in a planted 10 gal -
http/www.seriouslyfish.com/species/boraras-brigittae/
One thing you must bear in mind when choosing fish for your tank, is to find out what your water readings are, hard or soft water, pH and hardness levels are all crucial in determing if your fish will thrive or not in your water type.
You can find out most of these if you search your local water authority online or do tests to determine what you have that would suit whichever fish you like that would suit a 10 gal tank.
One more thing, you may need to cycle this tank in order to have fish that will survive in your tank. Basically means you need to grow bacterias that will deal with ammonia which your fish will produce every day. Have a read of this and would recommend you do a fishless cycle if you have not already done so -
Cycling Your First Fresh Water Tank
By the way, that particular site that gave you 93% stocking level is not a good site to go by at all, it tends to be rather unrealistic and there are too many variables for any site like this to be reliable.
Hope some of that advice will help you and welcome to the forum