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All the while they have to keep their skin wet to enable oxygen absorption.
FORWARD: This Aquarium Answers article (post) is not intended as a complete algae control article, but is intended to address the types of algae that I receive the most questions about which are Brown Diatom Algae, Freshwater Thread/Hair Algae, Black Beard Brush Algae (BBA), and Marine Hair Algae aka Filamentous marine algae (I address other algae as well in this article).
Generally simply scraping the glass and rinsing off plastic plants with a 1/25 bleach/water solution (followed by a rinsing with de-chlorinators and water) prior to your water change is all that's needed to control this easy to control.
These are hard circular algae spots that take hard scrubbing too remove from the tank glass.
I knew about fish that spend a good deal of time out of the water, and had heard of mudskippers.
I had no idea that males demonstrate their fitness through acrobatic flips and leaps, though.
Silicate is made up of silicon, oxygen, and metals such as aluminium.
As well, my methods may not work as well for some as all it often takes is new/different variable for an algae control method to be less effective.
In many of the methods (outlined in the removal tips below), the aquarist can lower the available silicates such as by simply adding plants or encouraging green algae to grow which will out compete the Brown diatoms.
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.
Note, cyanobacteria can mimic Brown Diatom Algae, but cyanobacteria are readily swept away with little effort while Brown Diatom Algae is not.
In low concentrations they probably don't have any noticeable effect in aquarium systems, and indeed they are probably always present.
This has been called "Green Snot Algae" (scientific name Didymosphenia geminata) and is becoming more common in streams just under the surface and/or covering rocks (pictured to the right).