So I have both a salifert and api test kit. The api constantly tells me my ph is 8.1-8.2 and the salifert constantly says 8.4-8.5 (same color each time just hard to determine) which one is right? Does it matter so long as it's the same everytime? I'm addressing this because I have not seen any growth in my tank and I've had coral around 3 months. I've had chaeto that long as well, and it has not grown or died either. I'm happy I'm not killing stuff but growing would be cool lol.