Need some opinions/advice. My LFS that carry saltwater fish is Petco. Other nearest stores are minimum an hour away. I've had a nano AIO running for over a year now and the current fish in there came from my local Petco. I quarentined them first and they are still alive and well today. I set up a 50 gallon tank with a sump a couple of months ago and it's now cycled. I set up a QT tank as well and am running a sponge filter that I had in the large tank sump towards the end/after cycle. I decided to go ahead and try some more fish from Petco. I bought an Ocellaris clownish first but it was the only one they had that night. Two days later I went in and bought another Ocellaris and they had one 6 line Wrasse in the same tank. Thinking how cool it was, I bought him too. I got them home and acclimated them and put in the QT. 2 hours later, both clowns are fine but the Wrasse went belly up. So I tested the water with the API Master Saltwater liquid drop tests and my water was showing fine. 8-8.2 PH, 0 ammonia, 0 nitrites, less than 5ppm nitrates. I called petco and let them know it died in 2 hours and the manager agreed to give me a credit for the Wrasse. I just had to take it in with a water sample. I read online that Wrasses are known to stress out during transport and I think them getting it in the same day and me taking it home might have stressed it too much. Next day I took my water sample in and Petco used Tetra tests strips to test my water. The lady tested it twice and said my water was bad and had alot of waste. The strips showed apparent high nitrite and nitrate she said even though there was nothing she was checking it against so I'm guessing she knew what the colors meant. I showed her the pics of the tests I took with my kit and asked her which one was accurate because they were showing way different results and she said she didn't know but she trusted the strips because they use them in all their tanks. Funny part is that they sell the liquid kit I use in their store. Then she followed up with she was not able to sell anymore fish that day because those strips showed waste. To take it a step further, I went home and tested my water again in the QT, as well as the water from one of the bags they sent home the fish in I bought the day before, and the results showed about the same. If anything, their ammonia was actually higher. Sorry this is long winded but my main question is, should I trust my kit more, or these strips that Petco said were more accurate? In the picture I attached, my water is on the left and Petcos on the right.