thanks for the support...
In this situation, Cloud eye is a tell tale sign a tat has crash injured it's eye(s). (This particular fish was starting to rot so that might be a symtom if decay.) Usually accompanied with knocked out teeth and scratched/flattened nose tip.
The broom ended fins are from 1) crashing through branches/plants 2) pleco's picking at the fins post death
Of all the specimens lost, (the ones i found before advance decay) none had chunks missing from tails, gash/shank marks on skin. At most the body had some scratches like when a car gets keyed and tathered fins which are signs of running into/thru plants/branches. A couple, including the last photo'd (less decomposed fish) wedged itself in a pocket space between some branches and the sideglass. Most other fish could back out. I guess payaras dont have a reverse gear, just freak out kill myself gear...

but to be fair, they evolved to live in open water.
I've seen first hand, 3 of my tats ; smash themselves repeatedly. This was stimulated by ambient/room lights turned on or off quickly while the tank light was off. Another time was a Change in airstone velocity + lights off. LFS have complained of the same.
Other times, it's just random. the tank lights go off on timer, most times it's fine, then sometimes I hear thrashing of water and bumping of glass immediately after.
There's a schedule.
Day 0: IMPACT
Day 1: imbalanced, disorientation, not eating, not in formation/shoaling, drifts where the water flow takes it.
Day 2-3: eyes cloud up, loss of color, head tail rolls, hardness of breathing. Death.
If the fish gets to day 1 condition, it's a gonner.
I found 4 already decomposed. The other 6 I watched check out as described above.
I think 1) my tank's a bit overcrowded and many of the fish have grown much larger and more powerful. 2) as you guys have mentioned the tats are not the alpha dog in this cohab. 3) tank is heavily planted which is widely warned against for this genre of fish 4) in living room where lights freaquently go on and off.
i believe the combination of the above lead to these fish dying. The only variable mentioned above that changed over time was the size of the tat and tank mates. The other fish also dart around or re-adjust when lights turn off, but none take it to the extreme the tats did.
They two left are keeping mid water.
The armatus are doing well. I just divided part of a tank out for them, being kept together with some Ace cudas and a non-Gatf-atf of compatable size.
All of the Hydrocygnus, cichla and Cuda stock will be transfered to the large tank when it's ready. couple catfish, tarpon, perches, birchirs, ciclids to fill in the gaps and colors. Still debating on whether to add the dorados. Hopefully the tats duo will last until then. If they do ok, i might grow out some more. I find it hard to believe they will injur the same in the new tank, as it'll have the space to do it's flight response thingy in 7-8ft deep water. But once again there's a cover and minimum wood features uptop. Should it happen there as well, then this fish and i have no destiny together.
