I am not opposed to using pesticides or fungicides (Used Malathion and Captan on the fruit trees for many years) but I always follow the guidelines when I use products on my plants and do further research. If a pesticide is not recommended for indoor use, please do not use them indoors. Those that sell fungicides and pesticides do quite a bit of testing of their products and, though they would love to tell you that their products are 100% safe, they issue those guidelines for your protection.
If you are having fungus issues, use more Calcium. It will not help older growth but the newer growth will be more able to resist fungus issues. Neem oil also controls fungus issues.
Pests are a bit more difficult. This year, I bought a bunch of organic insecticidal soap and Neem Oil but I am currently trying food-grade Diatomaceous Earth. If the DE doesn't work, I am going to wash the plants off with soap and water, then spray with the Insecticidal soap for three weeks. A new one is spinosad being used as a pesticide. Here is a fact sheet:
Spinosad General Fact Sheet
MJG 
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