I was gifted this Bonsai when my neighbor moved. Is this a maple? Height is about 20 inches with multiple trunks. Are multiple trunks normal? Have noticed that there is some slight browning at a small number of leaf edges. Was instructed to water with 1/4 cup of water once a week? Live in the Las Vegas area where humidity is normally 10-20 %. Was also told to keep it in a low light area. Are any of the instructions given to me counterproductive?