Hi,
Thanks for the advice. I'm in the UK so I'll wait for Wilder I guess. I've only got the ammonia and nitrite levels are both 0 ppm.
I've got some soft water cichlids in there (but nothing with a temper, and I've not seen any aggressive behaviour - he seems to be swimming alright so hopefully if it was some unwarranted aggression its subsided.
Thank you for your help anyways.