Yes, the flame dwarfs have the same requirements as any other dwarf - they are all the exact same species (
colisa lalia) - just different colors.
To be honest, I would not add any more top-dwelling gouramies to your tank. Gouramies are territorial and it's generaly best to provide at least 10 gallons per male when it comes to dwarfs and pearls. females work alright together though and seem to enjoy each other's company. Also, most gouramies won't 'school'. Pearls do if you keep them in large numbers in a good-sized tank and sometimes you get individuals that seem to like to 'hang out together' but they aren't true schooling fish and do better in conditions which are not crowded.
Note that your ruby sharks will kill each other once mature and may also pose problems for their peaceful tankmates. This is no over-statement. How large are they right now? Sharks majorly dislike each other. At least 1 will end up being bullied to death if you keep all 3. They should be kept singly.
If you want mroe colorful fish, I'd suggest some rainbows. Pracox rainbowfish are a manageable size. A group of 6-7 would look stunning. they are bright blue with red fins. They look drab when stressed at your LFS but quickly color up in the aquarium once settled in.
Boesmani rainbows and
melanotaeinia lacustris (turquoise rainbowfish) are another couple of rainbow species I like. These get larger though so care should be taken to not end up over-stocking. note that rainbowfish are schooling and must be kept in groups - 5 or more is reccomended.
Swordtails are another, very common but vibrant, fish I like to add to a tank, as a trio (1 male, 2 females) just to add a little extra activity and color.
If you are still after gouramies, consider some of the species that don't spend their time in the upper layers - croaking gouramies (
trichopsis vittatus), for example, aren't the most colorful of fish but they have bright blue eyes and can actualy 'croak'. They get to about 2".
If I were looking for peaceful, as well as hardy, fish, I'd go for the croakers:
http
/tropicalfishgallery.com/species-gal...an/vittata.html
http
/www.solodvds.com/remarks.asp?Name=C...uramis&ID=7
Unfortunately, none of these pictures show their blue eyes.
Note that it's best not to get any voerly-active schooling fish (such as the rainbows) if you want peaceful mid-dwelling gouramies and the sharks could also pose some threat as well.
Heavily plant your tank if you plan to mix lots of gouramies. It'll keep territoriality and aggression to a minnimum. if you can't use live plants, fake ones work just as well (but don't boil them - you are likely to expose deadly chemicals from paint/plastic if you heat them that much - that would explain your deaths).