Scott... poor fella. Bloody pond leak eh? Murphy had to rear his ugly head again.... When I got my contractors to build my pond, they had built over 50ponds b4 mine and never had a leak..... Guess what? My pond leaked at the begining too! (And of all ponds, it had to be MINE!!

) As always.... we'll just have to fix the leak won't we.
OK, now lets get brutal with koi selection...
Gin-rin Goshiki. Personally, I HATE goshiki. Not that I don't like their colour.... they just never work out for me! They've always ended up not the way I'd like them to.... hence the last few have ended up being 'given away'.
This fish however, has a very thick shoulder, thick tail tube and looks like a big head/mouth. Could possibly be a fast grower.... but I've hardly ever seen/heard a goshiki grow to enormous proportions. I know there have been goshiki hitting 80cm, but they are rare..... yours could be one of the 'rare' ones? Pattern wise.... not much to look at really. Would have liked the hi to be either broken up (ni-dan or san-dan would have been nice), or more of an inazuma (lighting) pattern. I suppose, if I got this fish, it would have been because I was hoping it could hit the JUMBO sizes and nothing else... The Gin-rin is not fantastic.
Shusui..... Not had very much luck with these fish buying at a small size either. Personally, I would not pick a shusui that had coloured up at such a small size. Likely to be a male (actually quite certain it is a male). Then the next thing is we hope that the the Hi on the back will keep it's colour. I've bought coloured young fish like that only to have the hi completely fade on me! Then if the Hi stays, chances are it will expand and cover the blue scales on the back... <_< The advice is usually to go for small fish that have Hi not completely coloured up, and the scaled on the back as light blue as possible. As the fish grows and ages, the blue on the scale becomes darker and darker. Ur fish will finish of with very dark grey scales. Fish looks quite clean on the head... so hopefully you'll get a nice clean white head when the fish grows up.
Trick to buying young koi is to take a punt and imagine them 2years down the road. A fish that shows all it's colour and is already 'finished' at such a small size are usually males... and are known as tateshita... "Already rans".
Your third koi would probably have been a locally bred fish... The Japanese would have culled that fish.
It's a mirror carp and probably falls in the "unique koi" category. Don't quite know if it's pretty or it's ugly....

It's definately not an Asagi that's for sure.
If you want to buy small koi, I suggest you go with Kohakus and Sankes.... much more 'stable' fish to start learning how to select young kois to grow up. Sanke's are interesting... Always a challenge to imagine where the sumi will come up or not.
Have fun buying nice koi... AFTER the pond is ready.
cheers
kev