Hi everybody My Hemianthus cuba is getting yellow. After seeing the symptoms on the internet, I realized that may be lacking in nitrogen. I started last week a treatment (Seachem nitrogen) and the leaves are still yellow. I realized also that my staurogynes are with black and transparent spots on their leaves. Could someone tell me if it really shortage of nitrogen? And these holes in staurogyna, which can be? My setup: Size: 60x30x30 - 20Gallons Lighting: 4x24W - T5 JBL Substrate: ADA Amazonia + ADA Power Sand Fertilizer: Brighty Step 1 - 3x times per week + diary brighty K PWC: each 3 days (40%) Temperature: 28 ° C (82 fahrenheit) PH: 6.8 KH: 6 GH: 5 Amonnia: 0 ppm Sorry , about my english. I am Brazilian. Obrigado!