too bad i can't help you very much, sometimes other's forget to see at the unread posts, sometimes they don't answer because the explanation is long, or maybe they are tired and don't wan to write in much words, my suggestions is use the search buttom, if you can't find anything, look on other websites, sometimes it helps, but to be honest with you this is the website with the most helpful information about CP's!!!!!FTC community is the best.
now i found this on google just by typing drosera slackii 'narrow leaf' care, i don't have one, so i don't know if this is the right info, but look at it, it might help you!!
http://www.ehow.co.uk/facts_7280735_car ... ackii.html
Good luck with your CP!!!!=)