Claire Corlett

Fish Food, Fish Tanks, and More
How to Remove Red Algae from Fish Tank | Aquarium Care

How to Remove Red Algae from Fish Tank | Aquarium Care


Okay. If you have red algae, you probably have a
salt water aquarium, because we don’t usually find red algae in a freshwater aquarium. Just in case, your algae looks a little bit
reddish, is in a freshwater aquarium, and it’s more like a rust color, that’s probably
just brown diatom algae. That plagues most new aquariums. If you give the tank a few months, it usually
kicks in and you get a lot less brown algae. You’ll start getting green instead, which
is a sign that the tank has matured. To get rid of brownish, red algae in a freshwater
aquarium, you can use algae eaters like otocinclus cats, Chinese algae eaters, and plecos to
scavenge the algae. You can also use fresh water snails. If it’s true red algae, like in a saltwater
aquarium, it’s actually a cyanobacteria. That’s telling that you have areas, where
you don’t have a lot of flow. You have a lot of waste build up, and this
bacteria is able to thrive. The key to getting rid of a lot of these algae’s
to out compete it for the nutrients that are available. You want beneficial bacteria to grow, instead
of the nuisance algae. That’s why people use refugiums. Refugium encourages macro algaes and lots
of bacteria to grow in an area that’s outside the aquarium to out-compete for the nutrients
that, otherwise, would be growing inside the aquarium. So, if you have red algae, and you want to
quick fix, you can get some of the chemicals that are commonly available at fish stores
like Anti Red or Chemiclean. They’re mainly oxidizing agents and antibiotics
like erythromycin. The antibiotics will kill a lot of the bacteria,
which is promoting this red slime.

12 comments on “How to Remove Red Algae from Fish Tank | Aquarium Care

  1. I've got a fresh water aquarium with tropical fish and I'm getting this red water on top of the lid through condensation. It has also stained part of my air pump pipe which is not submerged. Do you know what is causing this by any chance? The tank is clean and regular water changes happen. Fish are happy. Tank stays at 26 degrees

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