Name: Astyanax jordani
I keep these fish and they are well known to the tropical fish trade. They grow to about 10 cm long and are of the family characidae. Their latin name is Astyanax fasciatus mexicanus, but they were formally known as Anoptichthys jordani [Editor's note: the present valid name is Astyanax jordani]. They can grow to around 10 cm in length and are omnivorous ground feeders. As they naturally reside in underground caves in Mexico, they have had no need for eyes or natural colour, so they are just a pale pink with a slight hint of red on the fins and a shiny sheen. The eyes are completely covered with a layer of skin, but juveniles have small, black, useless eyes which soon grow over. They are nice aquarium fish, but sometimes cause trouble by bumping into other fish (and sometimes nipping fins if they feel like food). They are very active fish, and great fun to watch. I keep currently 3 juveniles in a 90 litre tank in my bedroom, and they are never aggressive to any fish. Highly recommended!
I have had 3 Blind Cave Fish for about 5 months now. They are an amazingly active fish and a joy to watch. They get the most attention out of all of my community fish from onlookers due to the fact that this fish doesn't have any eyes. Their sense of smell however is amazing, they are always the first to find sinking shrimp pellets, and sinking wafers. Keep them away from any aggresive fish, because they can't see, and when picked on by more aggressive fish it's completely unfair for them. Keep them in at least a group of 3, they bump into each other all the time while feeding and schooling, and if you only have one or two of these guys, they'll drive your other fish wild. My guys are about 7 cm long now and grew like weeds. I got them only 5 months ago and were about 3 cm in length when I got them. I would recommend these fish to anyone with a thriving community tank!
I've owned two blind cave tetras for about a year now. They're 8 cm in length and easily the most active inhabitants of the tank. They're notorious fin nippers, although I've found that once they've identified their tankmates as something other than food, they'll not bother anyone again. Just be careful not to overstock the tank, as they will be constantly bumping into (and therefore tasting) tankmates. You might want to avoid fish with long flowing fins, although I've found that a betta makes a good tankmate since he's a top dweller and the cave tetras rarely venture that far up. You have to be a little careful that these guys don't gobble up all of the food before other shy fish get a chance to eat. I like to throw something in that sinks to the bottom to distract them while I feed flakes to the rest at the top. For those who are having trouble sexing them: it's almost impossible unless you have a sample of each to compare to one another. From a side view the males are slimmer while the female's belly is rounded. These fish have been very rewarding additions to my tank.
I have had 2 of these for 6 months now and I love them. They are very active fish and as soon as I put food in the tank there furiusly swimming at the top trying to get food. I recommend this fish for any beginner, they are very peaceful.
I got 2 of these about 9 months ago. They are not aggressive and go with about anything. I had a problem with them and my red tail shark because he kept attacking them, but then they got used to the tank and knowing where everything was and stayed away from the red tailed shark's tower. These fish are fun and active, I recommend them to any community tank owner.
These guys are easy to keep and very hardy. They do well in community tanks, but when they get bigger, start regarding other fish as food. I didn't know where my neons were going, then found the rear half of a full grown coolie loach sticking out of a blind cave's mouth. They are amazing for their ability to navigate and feed obviously without sight.