Well I was not wanting to post again tonight to be completely honest but
@fcmf has spurred me on... and now
@Littlefish has posted whilst I’ve been typing....
I feel somewhat strange and conflicted and upset about all this... I did not manage to find the male earlier... I’m hoping that this means he is still alive and well and was hiding from view, but my emotions are preparing me for the worst. It’s one thing to loose a fish - I’m quite used to experiencing this - but to loose a pair, a species from the tank so suddenly would be something else entirely...
There are a lot of hiding places available in the tank due to all the decor and plants despite me moving quite a few of these around earlier. The fish were stressed enough by everything that I didn’t want to go further with it at that point so for now I have stopped looking... though I feel worse for not getting closure on it to be honest. Having looked back at dates etc I can see that I’ve had the fish 2 years which doesn’t exactly indicate a long life... but the Camallanus worm infection I somehow picked up last year may in part explain this... the female in particular was badly infected.
I feel really confused about whether to continue the search now but have decided to wait till tomorrow and it will have to be a complete strip down of the tank unfortunately to confirm things one way or the other... not something I particularly want to have to do but needs must at this point... he has been hiding a lot more recently (I thought due to the female) and I’m holding out that this is still the case and that he will feel more confident after the night has passed. The only positive I can draw right now is I don’t have to worry about water quality too much due to the heavily planted and mature nature of the tank... if that can be even called a positive...

and I don’t believe he would have been eaten by shrimp as I saw him eating well yesterday evening... but then again so was the female.... I just don’t know what to think...
I had a chat with Mrs Matt just now and she is also feeling that the loss of the female goldeneye was quite unexpected. She spends longer looking at the tank than me and has also not noticed anything out of the usual.
To be honest I’ve spent long enough thinking about this and rewriting it... thinking of something else... checking dates... the tank lights are off now there’s no point overthinking it - it will have to wait till morning now... I’m going to watch My Family in iPlayer as a distraction...
Open to any thoughts or suggestions...