hi, Im new to the forum and new to aqua-scaping altogether. current setup is: 80 litre Tank 2 x 24watt T5HO for 6-7 hours CO2 3-4 buble per second substrate: JBL Manado on Tetra Initial Stick Filter: 400 L/H canister Filter 5 fish otocinclus + 5 amano shrimp foreground plant is monte carlo, and background is umbrosum (CMIIW) i've got 2 problems like in the picture 1. there is some black layer on the leaf. i can rub the top of leaf (the black layer) and the leaf turn back color to green. Is it algae? how to cure it? oto and amano seems not like to eat this. 2. there is something like hair on the substrate and leaf. how to cure it? thanks in advanced! Hope someone can help!