Back from holidays! What's left?

I'm back from a 3-week holiday on the canadian Rockies. Gorgeous.

I had a (paid) guy come twice to feed live mosquito larvae to the Parambassis Ranga, but it was probably not enough: two casualties. The truth is, these guys barely eat, and surely they don't grow. As Neale Monks mentioned, it may be they're not Ranga, but rather a smaller species, or I do have a problem with them: 5 left of the original 10, bought in January. Next week I'll order the Vallisneria, and make a little forested corner, release the Parambassis from the nursery and see what happens: more than of being eaten by the archers, what I fear is that they will never find the food, once free  in the tank.

The archers are doing just fine: they've been fed with an auto-feeder, a small pinch of mixed dried food (Tetra Cichlid Sticks, Hikari Cichlid Gold, and a mix of tiny dried shrimp and crustaceans) per day. Two days ago I bought a box of flies: man, that was fun! They were happy like kids at Disneyworld! And hierarchy kicked in again, in that situation, in spite of the large number of flies available to everybody. It was interesting to see, however, that the two low-profiles fishes did make their "voice" (!) heard, a couple of times: flies are simply too yummy to give up!

On the mangrove side, two old ones I had are slowly increasing their roots. Unfortunately the one with the best root system (about 6-7 cm) is loosing all the leaves (had 4), which are blackening one by one. Only one is left.

The new ones aren't doing really well above water (totally dried up and black), and below only a tiny appearance of root is visible, which still gives some hope.

The best pair of leaves doesn't match with the best rooting system: for some reasons I have seedles with nice roots and bad leafs, and others showing the opposite.

This one has lost three leaves in the past couple of weeks. They started blackening, and then died. The last one left today had the first balck spot, too, shown below. What is it? I showered all of them yesterday with demineralized water, to remove any (invisible, anyway) salt that may have been extruded in the past couple of weeks.

The root systems of some of the mangrove propagulae: one is showing a beautiful, amazing growth of prop roots, whereas the other is rather faster in developing taproots. Why this difference??

The one with the best root system lost most of the leaves, and the one left today started showing signs of the same problem: turning black, and falling.