Thanks! I did what you said and didn't do any water changes for a week, and I got it tested today and it was sweet  :happy2:  
I'll up the water changes for a bit until the bacteria has time to catch up. 
 
Mum saw him at Animates today and couldn't resist  :lol:  She has a thing for them and paid for it and all (my last one passed away last week of old age). This one is really stunning, red with a gold underbelly and blue flecks like a ram  :love: