ok what the hell is going on in my tank Rip fella's

I don't know what to say except I hate to hear things like this as a forum is for sharing info and if there is no clues to what happened where to start. Did you die sect the fish I not trying to be mean or anything. There could be a internal parasite or something else that can not be determined from looking on the out side. I die sect any fish that has no apparent signs noticeable from the outside.

I am very sorry to hear this.
I've heard that flashers are susceptible and need extremely good water conditions. As for angles they do not tolerate low PH at all. If PH goes down and then is buffered through top up and it rises to fast it may become a issue due to stress over time. just a guess at what my be happening. Can you post all parameters maybe it is a combination of things that will show when all parameters are looked at together. I know on a forum down south they will not say much without having all parameters that you are able to test for at that time.

Once again sorry to here about this.
Bill