I hate sciarids. I did get the smallest pack of hypoaspis that Defenders do, and it filled all the pots in my infested conservatory and left enough over to be able to do the potting shed too. And I have a lot of pots.
Pity they don't do smaller packs, but I guess at some point it's uneconomic to do.
Normally I end up with red spider mite in there, but this year I've got the potting shed up and running at last and have put the aubs and cucumbers in there - so far, so good and no need for phytoseiulus...
moonbells