Instruct: Classify Amazon reviews into positive or negative sentiment
Query: CAUTION! Do not use in planted tanks with shrimp :-(

I selected Flourish Excel after viewing (and rejecting) several planted tank fertilizers that listed copper on their labels because I planned to add freshwater shrimp to the planted set-up. I used this product, and was pretty cautious with the dosing because the tank is a small one. I added the shrimp about a week later, but sadly, they did everything but "flourish" even though the tank was lush and green and the water parameters were perfect. When I tried to pinpoint the cause, I discovered that Flourish Excel contains copper after all! This should be clearly on the label so that planted tank enthusiasts don't unwittingly kill their copper-sensitive invertebrates.Bottom line: It might be a good fertilizer, but if it kills the tank inhabitants, it's still no good. Don't buy it if you have (or may have) freshwater shrimp or copper-sensitive plants or fish.