Well i have just done a 60% water change, removed a lot of the sand substrate and thoroughly cleaned what i have left. I also used a large fine filter sheet and spent the last hour filtering the water in the tank manually to remove as many of the floating planaria as possible, the tanks looking a lot better all ready but time will tell if i have made any difference, if it turns out it hasnt helped i will get some meds and treat the tank, fingers crossed!!!!!