Obviously it wasn't enough. Phosphate sponge slowed it down substantially. While the silicone or pumps must be seeding the tank with the red brush, it is taking 4 to 6 months to get this bad again. If I had dealt with it more quickly, I might have already won the war. This closeup shows the plants' development more clearly.
Older aquariums have different problems.
Phosphates from tap water, fish food and fish wastes can accumulate in the tank, feeding nuisances like red brush algae, and cyanobacteria. My 5 year old 40 gallon tank had a phosphate level of over 5 ppm despite repeated large water changes in attempts to flush the tank. Phosphate Sponge took it down to 0.25 in 72 hours. Ideally the 'Sponge' should not be left in the tank for over 48 hours, because the phosphates can be released back into the water, but I forgot. This product must be rinsed in clear fresh water, preferably Reverse Osmosis water, immediately before use.