yes u may directly spray onto the leaves/soil, but i highly suggest to bring it out of the cage if your plant(s) are potted...then spray it...once dried u may put them back...
yeah thats right @RcManChild .:DBingggooo ...the cage is heavily congested....thats why air circulation is goin gaga... maybe give a lil' more room for it to flow thru...
consider it as a experiment see w/c way works for u...
BTW.. any pic of ur cham?