Melanotaenia trifasciata. I think either location color variant are great! I agree with you the Marry river ones are some of the nicer ones. I bet if you look hard enough you will find someone around you that breeds them. If you get a chance, you might like the variant that comes from Rocky Bottom Creek, very intense reds and blues.
Melanotaenia splendida inornata These are the big guys in the video. Great fish, These are also among one of the most hybridized of the rainbows. I am not too worried about your source since the site goes into great detail to describe the capture locations. There are a few minor color variants of these too. The ones from south alligator River are some of my favorite, displaying a bit more green in the fins.
Melanotaenia australis Another great choice, I see these sometimes in a few of our LFS's.
Melanotaenia splendida tatei, this is a sub species of the splendida. For some reason there are a TON of these guys from different locations just different enough to classify them individually. If you go to keep two separate sub species of this fish make sure you can tell them apart. (especially the females)
All of the Melanotaenia species can hybridize with each other. While it is fairly rare in a closed aquarium environment it is something to keep an eye on. If you wish to breed any of them do so in a separate tank with a known male and female pair. Many of the females look similar to each other with very subtle differences in color and shape. It is frowned upon to knowingly put hybrids out there, so if you do have hybrids let anyone know that they are so.
Threadfin These guys are my favorite small rainbows. They are shy, and cautious and might not do well with the larger bows. not because of aggression on the larger bows part. They move slower in the water, and have VERY tiny mouths, so they might get out competed for food. There little mating dance is stunning to see! The body turns steel blue, and the fins a mixture of red, pink, and yellow! great little guys.
These little guys are very addictive. I have only kept a few species, but my list of "must keep someday" is VERY long lol.
One thing to keep in your mind if these are a choice. Male only tanks are done, the only problem is the fish color. They are TONS more colorful if females are present. For roughly 15 min. after lights come on in the tank they do the mating dance with a female. They will flash a stripe along the top of there head on and off, and flare with the colors of the fish becoming VERY intense. Males sparing usually is harmless, they circle around each other while flaring their fins. Great to watch. They are a slow growing fish as well. So the ones you get from Aquagreen might not be as colorful as they appear in the pictures right off the bat. Usually they start getting colors as they near sexual maturity. The high backs in the males come with age as well, there are pictures out there of very old rainbows that are almost circular lol. I usually keep a male/female ratio of 1:1 some recommend 1:2.
In the link I posted earlier, there is another link for the E-book PDF, Adrian Tapin did a great job on it, and it is my go to resource for rainbows. There are several photos from different collection points per fish, so you can see what color forms are out there.
Also check out Rainbow-fish.org and rainbowfish.info they are dedicated rainbow forums and a great source of info.
Thanks again for all the info and help, it's fantastic!
I am worried about hybridization, I wouldn't want that to occur. It's difficult finding photos of females which are for certain the species I'm looking at and not a misrepresentation or already a hybrid...
I decided that I'd go with the Mary River over the Desert sub species of the Spledidas, just to make it easier on me.. They seems too similar.
I'm thinking the Boesemanis (depspite being overdone) would look great with the Mary River M. splendida inornata. The yellow with the blue/green I think would look nice if I had 6 of each? Or is that not enough or each variety?
Yeah I was thinking they'd be practically white at 4cm big, but that's ok... More time for me to adore them as they grow
And even then, I'm pessimistic about them looking as great as the photos ;P Just a guide image, I suppose
I was planning on a 1:1 ratio, but on a few of the factsheets of AquaGreen he mentions maybe keeping 2 males to one female to keep their colors nice, would that cause undue stress, though?
I really like the Kutubu's you suggested (M.Lacustris), but read they can get nippy when older? I know you've been unable to keep them yet but you seem to know so much anyways, so is this true at all?
If I did the Boesemanis and the Mary Rivers, I think the Western M.Australis would add a nice touch or red.
I've seen the "Salmon Red Rainbows" and the shape of them isn't fantastic always, what do you think of these? They're bright, sure.. But I'm not sure I like them.
So sorry to absolutely BOMBARD you with questions, but you clearly love these fish and now that I have the image in my head I don't think I'll let it go ahaha
EDIT: With the threadfins, in a densely planted tank, would they feel more at ease? Or if they matured with the other rainbows, maybe? I don't want to put them in if they wont be happy.. But they are adorable and a nice group could be really sweet in my tank