The Dissolved Organic Compounds in the marine aquarium is the biggest contributing factor to red slime algae
Many years ago I had an ongoing problem with Red Algae in a 200-gallon Marine Aquarium. No matter what I did it was near impossible to eradicate. The pipe work and filters were also a problem as the spores of the algae were resident in these areas.
They primarily work by placing plants in the filter that do the job of absorbing nitrates and thereby starving the algae present in the aquarium. Through this a lot of unnecessary chemicals are removed that can cause algae to grow but are not required for the marine life in your aquarium.
How to Prevent Red Slime Algae in Marine Aquariums
A high pH helps discourage aggressive growth of Red Slime Algae
This menace is none other than Cyanobacteria, often referred to as blue-green algae in freshwater tanks or red slime algae in marine tanks. Cyanobacteria is one of the oldest living things on the planet with fossils dating to 3.5 billion years ago in the Achaean rocks of Western Australia. This is one resilient life form, but why has it been so successful? Simple, it makes use of the light waves that are discarded by higher plant life, lives in a wide range of temperatures, and subsists on organic waste materials including dissolved phosphates and nitrates. What do all of these things have in common? They are readily available in the artificially constructed environment of the home aquarium. Although it is not dangerous to the inhabitants of a freshwater or marine aquarium, Cyanobacteria can become an unsightly mess that can cover every surface of a tank in a matter of days.Red algae or as it is scientifically known is a type of algae that is primarily seen in saltwater aquariums, but is found in freshwater aquariums as well, though limited to a very few species.Instituting a clean-up crew in a marine aquarium can help reduce the slime but only treats the symptom of the problem, not the cause. The Red Scarlet Reef Hermit Crab is the best option for this method. It will readily devour any red slime algae in the tank. Unfortunately, there are no freshwater fish that graze on this “algae” and standard algae control additives fail to alleviate the situation. In a freshwater situation, removing it by hand is possible, but takes a significant amount of time and effort. There is, however, a procedure that can eliminate this particular bacterium from your aquarium, either marine or freshwater, in less than a week.As mentioned above I can remember when a good growth of any kind of green algae in a marine aquarium was time for smiles. That's no longer totally true in many marine aquariums, especially in reef aquariums. Only calcareous algae such as Halimeda or Coralline, or possibly a controlled growth of Caulerpa is considered acceptable. Filamentous or slime-like growths are almost always considered problematic and usually become costly in time and money to remedy.