http://overgrow.com/growfaq <--- all the anwsers you seek are there,
However, I think that you should have given them each their own bucket, but there is nothing that you can do about that now... I fert my soil plants once per week when flowering, but I use 1/2 strength ferts, I water every third day, usually, but if the soil is still wet, wait to water until it is almost dry. As for the trimming, you will probably need to as they grow bigger. If you think you can, you should try to transplant them into something bigger, maybe like a rubbermaid comtainer, plants need about 1 gallon of soil for each foot they are tall, so I think you should try to have 3-4 gallons per plant... just my opinion.


L0rdsOth