I need to do a major water change tomorrow in my 90 gallon reef tank. Been dosing Dino x to get rid of my Dino problem. Now that it seems to be gone and my corals are upset I have a few questions. How would I clean out the brown dust that is all over the floor of my sump seems to be dead Dino? Should I just blow it up and let the filter sock/skimmer pick it up? Should I buy a wet vac and try to suck it out with the water change? When doing a water change is it best to take most from the sump and leave as much in the display tank as possible? Also how do ppl vacuum a sump on the floor when you can't siphon?