08-31-2010, 07:41 PM
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Did you get this resolved?
If you have planaria and snails, there's a chance that the shrimp are dying from ammonia poisoning. Planaria are a sign of overfeeding (and in direct relation to overfeeding, ammonia). And snails, when faced with excess food, will just excavate their bowels and continue eating... This causes more of an ammonia spike than excess food rotting on the tank bottom. Snails have a high bioload, and it gets higher the more they're able to eat.
Also, when you stop overfeeding, and the planaria start dying, they will also foul the water a little, so keep up your weekly water changes!