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).