Here is some further information on the treatment of these rotten little S---S. After buying some Internal Parasite Clear and treating as per label for four treatments, it has only just bought some limited control of nematodes. So i was researching on some of the overseas forums in relation to using some type of fish for control and eradication, i found using Boraras (chilli rasbora) would be effective. This made me think, i had never had nematodes before in any of my tanks but i always had either Aust or PNG rainbows or Psuedomugi Gertrudae in my tanks and never seen a sign of nematodes. Fortunately i had some Gertrudae in an outside tank so i caught a few and put them in with the pests, after 20min to settle in they were actively devouring the nematodes as soon as one would show itself. It would seem i may have found my answer to eradicating these pests without the use of any chemical control. I have kept these fish with RCS before and did not experience any major losses of shrimp but the tank was well planted and with plenty of hidey holes. I will keep check on proceedings for next few days and let you all know on further results, but so far i am impressed.