Only just discovered this fishy thread too

Anyone keeping pond fish?
I've been keeping keep koi, orfe, mirror carp, shubunkin (and a few goldfish) for last 11 years. Inherited 3 very badly maintained ponds when we moved into our house and was bitten by the fish keeping bug. Got 10,000L outdoor pond and use Oase biofilters, pumps and air stones. Also carry out regular water quality testing and partial water changes when necessary - same principles as tank fish - nitrogen cycle etc. Koi can be quite destructive and will eat most plants so I leave pond clear of vegetation.
It is an addictive hobby!