Got about 30 krib fry in a 125L tank of varying sizes, with mum only (Dad died 6 weeks ago). They are about 3 months old now. All has been really well until last 2 days when they have gone really skittish, freaking out every time I go near the tank. They also seem pale, sitting on the bottom of the tank. It has been suggested that they have protozean parasites and need to be treated. Any ideas?