If your using already establish LR and tank water you should see little to no cycle at all... seed you sand bed if you plan on having one. With a tank that size your bacteria in your 75G will be enough to cycle that tank. Test for week add some food to make sure you don't have an ammonia spike then if it checks out OK then your in good shape. I did this a few time with a 10G nano and it worked out fine. but this is JMO...