I have tried to include pictures but for whatever reason, my work computer won't allow me tonight. The walls of my 20 gallon long aquarium is overrun with a green slime algae. I have scraped the walls, I have done water changes, but it just keeps coming back. My work schedule has been wonky so I haven't tested the water like I need to. But I tested it today and this is where I am with my water paremeters:\n \nHigh PH: 8.2\nAMMONIA: 0.25 ppm\nNITRITE: 0 ppm\nNITRATES: 0 ppm\n \nMy water salinity is high, it is at 40 ppt / 1.030 Specific Gravity. I need to do a water change but can someone lend me some advice please!\n \nAll I have in the aquarium are the following:\n \n1 Clownfish\n8 Turbo Snails\n9 Blue Legged Hermit Crabs\n1 Emerald Crab\n2 Peppermint Shrimp\n20 gallon long tank with roughly 15 - 20 lbs of Live Rock\n \nHope all this information helps!