Hi Stevie
Thanks for that.
I checked my water parameters as soon as,after they died and they were as they have been all the time.
Nitrite 0
Nitrate 12.5
Ph 7.5
Kh 3 to 5
Gh 5 to 7
I try to keep on the lower side to keep Ph down as much as pos but this does not change a great deal (just as I want it )the above readings are to keep in line with the parameters on the breeding section on Zebrapleco front page.(IMO I think lower Ph keeps eggs in better condition)
I won't use Ph down as think it complicates it more and that my Ph reading is ok my fish have bred in these conditions so can't be them.
It all went wrong when
1.I removed the fry he had banked up from the 1st to the 5th spawn there was so many. They caused eggs to be kicked out of cave.
2.6th spawn
He had a failed trapping in his cave with alpha female then next day trapped her again in his cave. Thats ok.
3.7th spawn
He trapped the female in her own cave next to his,so I moved him and the eggs in the cave after the female came out,to the original position of his cave,as the female was trying to get in the cave where he and the eggs were thinking it was hers.This was ok and all back to normal.
4. 8th spawn
This time he trapped the young female the day before in the cave next to his but was out next day with alpha female in his cave.That was ok.
I don't think this has affected the outcome of dead wrigglers.
I think he is a bit worn out and killing them.I looked to take out the remaining wrigglers this last spawn(they were very healthy and very mobile there was 6)I left them in to give him the a chance by the morning all dead!.
Sorry all a bit confusing.
So my conclusion is they are ok up to hatching (he looks after them well)after then they die (got to be him WHY who knows).
Thus this next time will take eggs out on the 4th day and see what happens.
Will keep you posted maybe saying about this on here might help some one with same problem at a later date.
Jerry

Caution is a most valuable asset in fish keeping, especially if you are the fish.