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Apparently, feeding too much dead fish to turtles leads to a build up in thiamin in their bodies, and then thiaminase, which is like an overdose of vitamins. If you cook the fish, it denatures the thiamin, that's why we don't get it, but I dunno about feeding boiled goldfish to your turtles. I'm not sure if you will get the same problem with live fish, so I could be like what eddie said about rising ammonia levels. I'm trying to find out if water snakes fed on live fish are vulnerable to thiaminase, but I've only read about it in turtles.
RES can do on some veg and fruit too like eddie said, any you give to torts, cabbage, carrots, etc. They also take insects, the usual crickets. Shrimp have just as much calcium as fish in their shells, but I think they don't have as much thiamin. You can get live shrimp, or the freeze-dried ones in cans. Liver is also good, it has vitamin A which is essential to chelonians. Most eye problems come form vitamin A deficiency. You can try any kind of liver, beef, chicken, pork, they are largely the same.
All the best, hope this helps.
[addsig]
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