Gee should this not be moved to Gars? other Beloniformes regularly are moved to gars just due to having the common name gar... if you care to be consistent should not halfbeaks also be sent there? They are belonids also...
Why was this post sent to Other monster fish? But a post clear and obvious as being about about Tetras and Needle fish (Beloniformes which are also halfbeaks) was openly sent to the wrong forum???
Really I'm just wondering....
Aside of that though Proaquatics if you can be more specific I have a great deal of info on these fish. There are many species and care is very different from one genus (and species for that matter) to the next. Blanketly covering all is not easy and there really is no website that covers these. Narrow your search here and I can help you out.