Originally Posted by
Discluv
What is your KH/GH, and TDS?
Water Params: ammonia, nitrite, nitrate?
What kind of shrimp are they?
Shrimp are very sensitive to any chemicals added to aquarium. I use Thrive also in my tank with shrimp, but only once weekly. You are dosing too much.
Feeding shrimp every other day is too much unless you have a well-established colony- which it doesn't sound like you do. Overfeeding is one of the most common ways to kill off shrimp-- especially from the rot from uneaten food fouling the water ( which may or may not be detected by testing). If shrimp dpo not swarm to food very quickly and finish food within a few hours, you are feeding too much.