Help! my 5 clowns will not stop flicking!! They are all about 3-4 years old and for the last 5 weeks they have continuously flicked. My water tests out fine,i have treated for whitespot,parasites,worms,just about everything i can.I do regular water changes.This is doing my head in,my clowns are now badly scarred and look like they are going to end up killing themselves.Please please help me !!!