It's been a month but let me guess, you still have a few of your original shrimp left? I think it could have been a case of too many too soon, overloading the filter and getting an ammonia spike. As the shrimp died and got thrown out your ammonia would naturally decrease, being converted to nitrites then nitrates. Would have been interesting to measure the ammonia at the time of the die off. If any survived, they might be ok now that your tank has (hopefully) cycled.









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