i got home today and found my water had stopped running back to my tank from the ehiem 2080 filter , on inspection i found that a snail had got into the strainer while small , grew to a good size then layed half a million little snails in the pipe , they then grew to a size that blocked the pipe ,i dissmantled the pipe work and cleaned it all out but i want to make sure i have no survivors , and that will be the last time i put a bit of pre soaked bog wood plant into my tank ,,