I am looking at parasite diversity in snails but I found some reads which came up as two parasites in my negative. One parasite has 112 reads in the negative and the other has 99 reads in the negative. Both of these parasites are also found in some but not all of the snail samples. Some samples have very high reads of these parasites and others have fairly low reads and some have none. I do not want to remove the whole sequences as I know that these parasites are meant to be in the snail so must be some cross contamination. Someone suggested that I just remove the number of reads found in the negative from each sample. Is there a way that I can do this through the filter table plugin in qiime2? Is this the best thing to do or would it be better to just leave it and mention that these two parasites were also found in the negative and should be interpreted with caution?