I don't know about tanks, but this community lake needs the fertilizer runoff stopped, which is most likely the largest contributing source. That is a huge step in the right direction. Then hopefully you can get natural methods to compete with it. Beneficial bacteria, plankton blooms, shade plants, algae eating critters. Those would all be long term solutions. For this season, you may have to bite the bullet and copper it out with algaecide and manually remove what you can for the quick fix end of it. But again, with a body of water this large, you need a long term plan and treat the source. Residential runoff into a community lake is a tough spot, keep up the good fight.
