Hi, I am new to this site and I really need some advice urgently... The problem is as follows I have have kept tropical fish for around 18 years with lots of sucess and have been keeping Discus for around 1 year with no problems up until now!! I have never really had problems with disease other than whitespot, however my discus have began dying as did my rams. The tetras are ok at the moment and the water quality as ever is spot on, based on their symptoms I thought it might be Velvet disease, so off I went to get some treatment, came back opened the lid and to my horror the tank was absolutely jumping with what can only be described as LICE they are everywhere, with the average size being like a pin head I have never seen anything like this in all my years and was wondering how to treat this?? And also where did they come from?? there has been no recent additions, so I can only presume they have came in with the Live bloodworm I feed them.. Any replies would be much appreciated.. Thanks