Your tank might go through a soft cycle then with some of the rock drying out. Check for any ammonia and do wc's if it gets above .25ppm. You can use these changes to siphon out the sand to if you decide to (again I highly recommend this, sand is probably the cheapest part of the reef tank so why let some one else's dirty sand ruin your new tank when it can be replaced for $30-$40, JMO though). While a brown is definetly better than clear, it still shows that the corals aren't getting enough light. My advice for saving these to is to leave them in the places they are in and keep your water params in check. Euphyilla corals do not like to be touched and moved and can adapt to a wide range of flows, so let them recover and maybe look into upgrading your light. The taotronics dimmable LEDs on eBay are priced well and should let you keep anything you want
Edit: general rule of thumb, coral browning= not enough light, coral bleaching = too much light