I hope not, the tanks only 6 mths old and I do 20% weekly changes, tests are all good, skimmers doing well and just added phos remover. Two of my big rocks are still cooking.
light is not a prob, mine also grow in the shady spots like under the spraybar and under rocks and power heads. They are small and its not a huge population.
I'll monitor numbers and if it continues to grow then I'll freak