yeah I was just at Redwood yesterday and they had red-finned halfbeaks listed on their board of fish available but not on display (because for some reason they don't like putting the good fish out where people can see them...maybe they're afraid of sales). I'm assuming from the name that they are the Sulawesi species Nomorhamphus ebrardtii.
This is what I stole off the net:
Nomorhamphus ebrardtii (Popta, 1912). Another Halfbeak from the island of Sulawesi, this species is sometimes sold as the “red fin halfbeak†but is more often simply included in batches of Celebes halfbeaks. Unlike Nomorhamphus liemi, this species has a straight beak and the fins are edged with thick bands of orange. It is quite a large species, with females around 11 cm (4.5 inches) in length and males around 9 cm (3.5 inches). Nomorhamphus ebrardtii is found in coastal waters rather than rainforest streams, and needs moderately hard, neutral to slightly alkaline water. It will also tolerate slightly brackish water (SG up to 1.005).