I would second Dave's recommendation of some mexican pings such as P.
moranensis to get rid of your thrip problems, although a large
infestation would kill the pings. I know it will cause hell for the
pots of neps, but perhaps a couple of D. capensis normal form would be
good. I know my d. capensis plants get rid of massive infestations of
greenfly and aphids.
Toby