eSHa Gastropex – Aquatic Snail Treatment. eSHa Gastropex effectively combats aquatic snails in your aquarium. Use Gastropex to stop snails destroying aquatic plants and transmitting disease to your fish. Can be used as a preventative bath for new plants, this prevents snail colonisation and the runaway growth of micro-organisms. – Destroys all aquatic snails. – Safe to use with fish and plants. – Clears cloudy water (bacterial Blooms) and combats Hydra. – Usually no extra water change required after use. – Suitable for tropical freshwater and coldwater aquaria. 10ml treats a maximum of 500 litres (110 gallons) of aquarium water.