Colombo Morenicol Lernex is available in the following sizes - Colombo Lernex 200g - Treats 5,000 Litres. - Colombo Lernex 400g - Treats 10,000 Litres. - Colombo Lernex 800g - Treats 20,000 Litres. Skin and Gill Worms (Flukes) are flattish trematodes, 0.3-0.5mm in size which were previously relatively uncommon in pond fish.
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