eSHa Hexamita - Discus Disease Treatment. eSHa Hexamita is a unique treatment that combats disease in Discus and other Cichilds. - Effectively treats 'Hole in the head disease'. - Effectively treats other bacterial and fungal infections. - Prevents disease in newly acquired stock. - Protects fish from secondary infections. 20ml treats a maximum of 800 litres (176 gallons).