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It's generally a good sign if that is the only algae that is noticeable in your tank.
This is the algae that coats the front and side glass.From the Aquarium Answers article; “Aquarium Test Kits” here are some silicate parameters: Natural seawaters contain silicates around 10 ppm however due to differences in a closed system (which an aquarium is) and the ocean it is best to maintain silicates under 1 ppm in an aquarium to prevent diatom blooms and aid in uptake of essential elements such as Strontium by corals.Reference: Aquarium Test Kits; Information, Review Product Resource: Salifert Silicate/Silica Test Kit In freshwater, silicates are generally between 4-20 ppm and should be kept under 4 ppm in an aquarium, although usually this is not a problem in healthy established freshwater aquariums where lighting is good to encourage plants or green algae (both of which will starve also consume silicates limiting diatom growth).Diatoms are a major component of plankton, free-floating microorganisms of marine or freshwater environments.Not all diatoms float freely though; many may cling to surfaces such as aquatic plants, gravel, décor, molluscs, and crustaceans.This is a common algae in new aquariums (including marine tanks), especially aquariums that have not fully cycled as this leaves many available nutrients for these diatoms.
If an established aquarium struggles with these diatoms, this is often an indicator of excessive silica, poor mineral/electrolyte balance, an unstable biological aquarium environment, which in turn is often caused by poor filtration, poor cleaning procedures, Redox balance, inadequate aquarium lighting or over medication.
Many of the methods cited here for algae control address the bio filter, but some do not and those that do should be used first based on my experience.
The bottom line is I do not claim that this article is the "end all" for algae control, but I do think the majority of readers will find this article useful, often with information not found elsewhere.
Finally as per Silicates, do NOT confuse these with silicon/silica, as the later is inert while Silicates are not!
Silicate is made up of silicon, oxygen, and metals such as aluminium.
Updated 10/18/17 Brown Algae is not considered a true algae as per many biologists, rather a diatom.