Nah that wont matter the slightest, you could of planted your seed literally anywhere in the pot and it would still grow fine. For the temps, most strains will be able to survive in night temps down to 45-50 degrees once they are a few weeks old. In fact, I prefer my night temps to go down into the 50s as it gives your buds a nice purple color, although it does slow down growth a bit. When they are recent sprouts I wouldn't let the temps go below 60.