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For the past year, but not before, my shrimp tank has been suffering from a major excess of what I call 'fur algae'. It coats every broad leaf and surface in light green fuzz. There is also hair algae. What can be done to control this safely, with CRS and Cherry Shrimp in the tank? I already have one 7cm Otocinclus. The tank is 60cm. Water quality is excellent, with Nitrate and all of its friends reliably at 0. KH 1.5. GH 5. I should point out that two things changed before this problem began: - I changed the lights from fluorescent to LED (white with a dash of red and blue in both cases). The LEDs are visually so much better. - I added a moss ball that was sent to me as an unauthorised freebie from a UK aquarium supplier. I wonder whether it seeded the fur algae? Any recommendations for resolving this please, based on successful experience rather than conjecture? Thanks :)