I would definately use the bacterial med on him.
The yellow can you describe the texture of it, have you shined a torch on the patch with tank lights out yet,
Columnaris comes in a yellow colour as well as the more common white colour.
Red spots on skin can be caused by:
Regarding the small red dot, small pinprick like haemorrhages (called petechiae) can be due to a local lesion, a generalised septicaemia or toxaemia caused by acute viral and bacterial infections
http/www.lifeforceonline.co.uk/fish_dise...product590.html
The yellow can you describe the texture of it, have you shined a torch on the patch with tank lights out yet,
Columnaris comes in a yellow colour as well as the more common white colour.
Red spots on skin can be caused by:
Regarding the small red dot, small pinprick like haemorrhages (called petechiae) can be due to a local lesion, a generalised septicaemia or toxaemia caused by acute viral and bacterial infections
http/www.lifeforceonline.co.uk/fish_dise...product590.html