That's weird. I thought Drosera capensis was tolerant of a wide range of growing conditions. Sounds like yours is quite picky.Update:
D. capensis HATES IT! But when I take them out and put them back on the windowsill they do fine.. So maybe my tank is too hot for them??
!
D. natalensis (aka often mislabeled as dielsiana) likes conditions similar to capensis, they come from the same region. Possibly the reason why yours are struggling may be the same reason the capes don't like the tank.