SO MY TESTING KIT CAME TODAY AND I TESTED MY WATER LIKE 3 TIMES , PH IS A LITTLE HIGH, AMMONIA IS AT A GOOD LEVEL, NITRITE IS AT A GOOD LEVEL, BUT MY NITRATE IS AT ABOUT 15PPM, I THINK THIS IS THE REASON WHY MY NEW SHRIMP DIED WITHIN HOURS...ANY ADVICE? I WAS PLANING TO GO OUT AND BUY NITRATE...