fafa: 1. 9W of light is not enough, even for 陰草. 2. Some c hings says CO2 is not a must for 陰草 but I highly recommend to have one. If you will have one, then you may need to replace the hang-on filter. Hang-on filters will affect the CO2 dissolving rate. 3. You'd better add some bottom sticks in the 黑沙. Plants need fertilizers.
_________________ 24"x12"x14" w/ Eheim 2026+Artica Mini BCD T5HO 24Wx3 Lighting: 1:00pm-9:00pm CO2: 2 bubbles/sec ADA Amazonia I