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mat - fukien teas can be a bit fickle, i've learned, especially when it come to the water aspect. you are right that fukien teas don't like to be dry but on the same token they definitely don't like to be too wet. watering is an art form when it comes to bonsai. the yellowing of leaves and brown spots sound a lot like a fungal infection, most likely due to over watering and poor air circulation. i would try to put a little fan in the vicinity of your plants. also, use the chopstick test for moisture content in the soil. stab a chopstick into the soil towards the middle of where the root mass is and wait for 10 minutes or so. pull it out and if the stick is damp, don't water for another day or so, then check again. i'm not sure what region you live in, but if it gets cold outside and daylight really decreases, then even tropical trees enter a pseudo-dormancy period where they don't grow much and don't use a lot of water. this can be the trickiest time for beginners to keep bonsai alive and healthy. good luck! - wade