Mo is right. The reason your dojos aren't growing as large as they should be is due to poor living conditions and bad diet. If you are going to keep a coldwater fish in tropical temperatures, you need to up their food intake or else they will starve to death. Fish metabolisms are regulated by the temperature. A coldwater fish living at tropical temperatures will need to eat more to maintain a healthy body weight.
Originally Posted by Olympia
Dojo loaches are raised for food, I hear. O.o
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They are a food fish in Asian because they get so big and taste like eels (mmmm unagi nigiri). They are also invasive in the cooler areas of the US and are illegal to keep in some states (not the southern states because they are not a tropical fish). I love the eely look, but the dojos I had with my goldfish took a liking to the goldfish's slime coats. I had to say good bye to them, but they went to another good aquarist.