Thanks Adam

..I'm still over the moon 24 hours later.
I'm considering trying to get the ones I can see into the fry trap...OK I admit partly becsause I bought a posh little fry trap with it's own spray bar (I'm a gadget freak

)...but if their too much trouble to find or it's going to cause too much distress to the male and female in the cave then I'll just leave them in there. I would still like to know how many there are though.
As for whether there is another female spawning in the tank you could be right. I''ve just got home and had another look at my tank and the male definitely has another female in there...but strangely the cave next door, which is usually empty (it's a little smaller than the others which is why I think it's unused) has a zeb sat in it who is huge. If it's a her then her abdomen is very swollen...more than I have ever seen before. Maybe she's waiting till the other female gets out and then she'll get in...which is now making me wonder. Could they possibly kill the male through exhaustion?

I realise this is a long shot...but were my tank last week seemed quiet and peaceful now seems more like a brothel offering discount rates.
Perhaps I should just concentrate on rearing these fry and cross any other bridges if and when they happen.
You're right though, I hadn't realised quite how bloody chuffed I would be when they spawned..9 months of work, quite a lot of money and lots of travelling has finally paid off. Funny thing is...I was pretty sure I had no females in the tank, so in October last year I paid far more than I told myself I would ever pay for a zeb and had
two (5.5cm) shipped over from Germany...they were both good potential females as I had requested and they're both still sat in the tank doing nothing. God knows what'll happen when they get mature.
Anyway, thanks for the congratulations and readily accepting to help with any further questions that I'll be putting forward in future. Although, I promise to search the forums previous topics for an answer first.
Cheers
Plastic Mac