08-30-2009, 01:06 PM
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Here's a method I used when one of my group of Congo tetras developed blindness (there were five, one became blind, and there were plenty of other smaller fish in the tank at the time).
In the evenings I feed frozen food like bloodworms, daphnia; and back at the time I had the congos I offered live tubifex and brine shrimp once a week when it came in to the lfs. I use a long piece of stiff tubing connected to a longer piece of regular airline tubing. I syphon up the food with the stiff tube end (by mouth, being careful and having a long piece of flexible tubing it's fairly safe once you get used to it) and squirt it right in front of the fish. The congo knew from past experience when food was offered, even in the mornings when flake was given--I always tap lightly on the tank when I open it to feed, and it is like a dinner gong, all the fish immediately come to the surface and the bottom fish begin scurrying around the substrate. The blind congo always manged to get what it needed. It lived for several years.