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try filtering over a layer of aquatic peat. this will bring your ph and hardness down, however, RO water will be cheaper and safer and the long run. No need to buy commercially available buffers. Mix with your tap water. It will take a little bit of experimenting to get the water you want but is...
I used to have hair algae. You don't mention your stocking levels but I would try a uv clarifier and a layer of zeolith in your filter. The UV will kill the spores and the zeolith will take the nitrates and phosphates out of the water. Additional CO2 might help but watch your pH if your water is...