I'm an Idiot

[George]

well, I think a diatom filter is as useless as a UV filter in terms of figting ich. You have to some how get all the free swimming ich to get pass the diatom filter or the UV filter before they attach to fish in order for them to work, assuming the filter is the right size with correct flow rate. That is not possible. You fail even if one ich parasite finds the fish before it goes through the filter.