I don't have an outdoor garden, but I have tons of edibles growing in my bedroom containers. I was aphid-free for a while but alas, they finally got in and are having a blast. I've been picking them off and squishing them to death whenever I see them, but it seems like every time I look there are more than there were last time. I can't spray the plants down with a hose and I doubt I could really get them all with insecticidal spray. Do you think I might be able to use ladybugs indoors? If so, any tips on catching/keeping them?