Common Ember Tetra Health Issues (and Why the Ich Heat Cure Stops at 82°F)

The ember tetra is a fish of about 0.8 inch from the soft, weakly acidic backwaters of the Araguaia River basin in central Brazil, and no disease belongs to it in particular. It meets the problems any small soft-water tetra meets, and poor diet and poor water quality raise the risk of every one of them. Where it parts company with some of its relatives is temperature: the top of its range sits below the heat that kills ich, and that changes how the disease gets treated.

Signs That Need Action Today

A head count at feeding time is the daily check in a school of 10. These are the signs that cannot wait for tomorrow.

Test ammonia and nitrite first:

• Fish gasping at the surface or breathing fast.
• Two or more fish showing the same sign at once.
• A fish found dead. Take the body out of the tank before anything else.

Start ich treatment today:

• White spots like grains of salt on the body or fins.
• Fast breathing that continues once the water tests clean, since ich can infect the gills.

Watch closely and check again tomorrow:

• Flashing: rubbing against plants, glass or substrate.
• A fish off its food or hanging listless.
• Extra mucus on the skin.
• Color fading to dull.

The last group are the early signs of ich, and they show up before the spots do, so a fish showing them gets a close look for spots every day until the signs pass. Gasping, lethargy and a lost appetite are just as often the water as a parasite, which is why telling a water problem from an illness starts with the test kit and only then moves on to the fish.

Water Quality Comes First

Embers come from soft, weakly acidic water, and they do best kept in it: 75 to 82°F, pH 5.0 to 7.0 and 1 to 10 dGH. Holding the tank steady inside that range matters more than hitting one exact number, and a liquid test kit run before each weekly water change catches a drift before it harms the fish. In water this soft, KH is what holds pH still, and it is the reading to understand before adjusting anything.

A dull ember usually means its care slipped somewhere along the way. Diet is the other half of it. Overfeeding brings a run of health problems, and an ember's small mouth takes tiny, slow-sinking food, so a fine food fed in small amounts suits it better than a pinch of flake that drifts down uneaten.

Company is part of health too: an ember is a shoaling fish, and a school of 10 is part of keeping it well.

Ich: Warm to the Ceiling, Then Treat

Ich, or white spot disease, usually reaches a tank through infected water or a newly added fish. The spots on the body and fins tend to appear long after the infection starts, so the watch list above is usually the first warning. A fish whose gills are infected breathes fast or gasps at the surface. A large infestation can kill, especially in a fish already weakened by something else.

Most strains of ich cannot survive water above 86°F, and for fish that live comfortably that warm, holding the tank there clears an outbreak. The ember's range tops out at 82°F, four degrees short, so the heat method is not for this fish. Heat still helps up to its ceiling, because the parasite multiplies faster in warmer water and a faster cycle brings each new generation into reach of the treatment sooner. Raise the tank slowly to 82°F, using a reliable aquarium heater, with an air stone running for the extra oxygen warm water needs, and let one of these do the killing:

• Aquarium salt, never table salt, at about a tablespoon per 5 gallons, added gradually so the fish have time to adjust. Once the infection clears, several water changes take the salt back out.
• An ich medication, dosed to the label or to a vet's directions. Vets typically treat the water with formalin or copper sulfate products over several doses.

Keep the treatment going until every sign of illness is gone. Warming to the ceiling and treating is the same route every fish whose ceiling stops short of 86°F takes, the neon tetra among them. Dwarf shrimp often share an ember tank, and they come out before any medication goes in.

Neon Tetra Disease

Neon tetra disease is caused by a microsporidian parasite, Pleistophora hyphessobryconis, named for its type host, the neon tetra. It has been reported from many species of aquarium fish in several families, zebrafish among them, so the name does not confine it to neons. The rule that protects any school applies here as well: a dead fish comes out of the tank as soon as it is found, whatever killed it.

Quarantine Every New Fish

New fish are the usual way ich reaches an established tank, and a separate tank is worth having no matter where the fish come from. Every new ember spends at least 30 days in quarantine before it meets the school. A modest separate tank with a gentle sponge filter covers it, and the same tank becomes the hospital when a fish gets sick.

Arrival day carries its own risk. On a long trip, ammonia builds in the bag from the fish's own waste and pH drops as carbon dioxide rises, so the fish arrive already under strain. The bag water stays out of the tank, since it can carry that waste and pest snail eggs along with it, and acclimating fish this small means checking the bag and the net afterward for any that got stuck.

An ember that is eating, holding its orange color and moving with the school in steady, soft water is a healthy one. Nearly everything that goes wrong with the species starts in that water or arrives with the next fish.

Sources & Further Reading