Try raising the temperature gradually instead of all at once. He's native to warm regions, so he should be able to tolerate it, he's just not used to it, lol.
Hmm, red legs is more a symptom of redleg than dropsy. I just wouldn't want you to wind up treating your frog for something he may not have. I don't know as much about red leg, aside from that it's pretty bad. I'll see what I can find though.
As for me, I have too many pets

But not as many as I once had. I guess since I was asked, I can present a current pet list...
MAMMALS
0.2.0 fancy rats "domestic norway rats" (Rattus norvegicus)
2.3.0 fancy mice "domestic house mice" (Mus musculus)
REPTILES
0.1.0 Florida red-bellied turtle (Pseudemys nelsonii)
0.1.0 red-eared slider (Trachemys scripta elegans)
0.1.0 unknown side-necked turle (Pelusios sp.)
1.1.0 western plains garter snakes (Thamnophis radix haydenii)
0.1.0 Asian vine snake (Ahaetulla prasina)
0.0.1 black rat snake (Elaphe obsoleta obsoleta)
1.0.0 masked curlytail (Leiocephalus personatus)
0.1.0 yellow-throated plated lizard (Gerrhosaurus flavigularis)
0.1.0 regal girdled lizard (Cordylus regius)
0.1.0 tropical girdled lizard (Cordylus tropidosternum)
0.1.0 white-spotted wall gecko (Tarentola annularis)
AMPHIBIANS
1.0.0 blotched tiger salamander (Ambystoma tigrinum melanostictum)
1.0.0 northern leopard frog (Rana pipiens)
1.0.0 southern leopard frog (Rana sphenocephala)
1.0.0 European green toad (Bufo viridis)
1.0.3 Oriental fire-bellied toads (Bombina orientalis)
1.0.0 Cuban tree frog (Osteopilus septentrionalis)
0.0.1 White's tree frog (Litoria caerulea)
1.0.0 tiger-legged monkey frog (Phyllomedusa hypochondrialis)
0.1.0 African clawed frog (Xenopus Laevis) "albino"
0.0.2 dwarf clawed frogs (Hymenochirus sp.)
FISH
0.0.1 shark catfish (Hexanematichthys seemanni/Arius seemanni)
0.0.2 three-spotted blue gouramis (Trichogaster trichopterus)
0.0.1 unknown plecostomus (family: Loricariidae)
ARACHNIDS
0.1.0 Chilean rosehair tarantula (Grammostola rosea)
0.1.0 zebra tarantula (Aphonopelma seemanni)
0.0.1 Usambara orange baboon (Pterinochilus murinus)
0.0.1 uknown baboon (Pterinochilus sp.)
0.0.1 Haplopelma longipes?
0.1.0 daring jumping spider (Phidippus audax) "red bryantae morph"
0.1.0 Egyptian deathstalker (Leiurus quinquestriatus)
1.1.0 Arizona bark scorpions (Centruroides exilicauda)
0.0.1 black-top desert hairy scorpion (Hadrurus spadix)
1.1.0 emperor scorpions (Pandinus imperator)
0.0.2 Walberg's burrowing scorpions (Ophistothalmus walberghi)
0.2.0 giant vinegaroons (Mastigoproctus giganteus)
INSECTS
1.0.0 Madagascan hissing cockroach (Gromphadorhina portentosa)
CRUSTACEANS
0.0.1 unknown crayfish
CHILOPODS
0.0.1 unknown "Texas" centipede
MOLLUSKS
0.0.2 unknown land snails
0.0.2 giant leopard slugs (Limax maximus)