I've had blood fin tetras for years with good luck. Now they are dying one by one every 1- 2 weeks. No sign outward of illness . Look healthy. All aquarium conditions have remained the same. It started after I introduced a new group from pet store, perhaps those fish carried something? How should I proceed?
Fish Forum - Bloodfin Tetra Profile
The Bloodfin tetra is easily recognized on its colourful fins. The caudal fin, anal fin, ventral fins and dorsal fin are of a vivid red colour that contrasts brightly against the silvery body. This fish species is however not only appreciated for its beauty; it is also an active and sturdy fish that can live for over 10 years in captivity. The Bloodfin tetra is recommended for beginners and is an alternative to the more famous Neon tetra.
Aphyocharax anisitsi, Bloodfin tetra : aquarium - FishBase
Aphyocharax anisitsi is not the only fish species commonly known as Bloodfin tetra; a close relative named Aphyocharax alburnus is also sometimes referred to as Bloodfin tetra. Both species are characins belonging to the genus Aphyocharax in the subfamily Aphyocharacinae. Aphyocharax alburnus is however more commonly known as the Goldencrown tetra and using this name is preferred, since it decreases the risk of confusion. Both species are very similar and appreciates roughly the same conditions, so if you are unable to find specified information regarding Aphyocharax alburnus you can often glance at care recommendations, breeding information etc regarding Aphyocharax anisitsi instead.
Bloodfin Tetra | Tim's Tropical Fish
The Bloodfin Tetra is a mainstay of the freshwater fish hobby and for good reason. Bloodfin Tetra have silver bodies with an almost greenish hue (depending on the aquarium lighting) and red fins. A great freshwater beginner's fish, the Bloodfin Tetra will to tolerate a wide range of water parameters. Some hobbyists even keep them in cold water tanks or tanks without heaters. They will tolerate a lower temperature than other tropical fish, but use a heater to keep the temperature stable. Avoid widely fluctuating water temperatures that could stress your fish.The Bloodfin tetra is a shoaling fish and you should therefore keep at least five specimens together. When a Bloodfin tetra is kept alone, or in a very small group, it will usually become very shy and spend most of its time hiding. In a shoal, they are much more bold and active and spend a lot of time out in the open. A Bloodfin tetra can sometimes leave the group and explore the aquarium on its own, but it will always return to the safety of the group as soon as it feels threatened.The Bloodfin Tetra is another fish that isn't too picky about what it eats. A good quality flake should form the main part of their diet with supplemental feeding of brine shrimp (live or dried), frozen freshwater foods and live foods such as worms or small insects.Bloodfin tetras will often spawn spontaneously without any coaxing from the aquarist. Their natural instinct is to release the eggs among broad-leaved plants, but if no such plants are present they will sometimes release the eggs over aquarium glass. The eggs are not adhesive.
During the spawning, the Bloodfin tetra will leap out of the water and the eggs will drop down. One female will usually produce between 300 and 500 eggs during each spawning.
Since it is an egg-shattering species that do not engage in parental care, it will not hesitate to eat its own offspring. A lot of eggs and fry will therefore be eaten by the parents, or by other fish in the aquarium. You can increase the chance of fry survival by keeping the aquarium densely planted. Do not only use broad leafed plants in your Bloodfin tetra aquarium; include fine-leaved species as well since they provide better protection. You can also spread beads over the substrate to create hiding spots for eggs and fry. Professional Bloodfin tetra breeders usually set up separate breeding aquariums from which the adult fish is removed directly after spawning. This will promote a much higher fry survival rate.