-To get problem algaes (and this might even include coralline) off the glass/acrylic, attach your credit card scraper about 1/4" ahead of your siphon tube. That way, when you are changing water, you can also take out the algae without the spores floating all around the tank and possibly growing somewhere else.
-Wear sunglasses or polarized lenses when you need to do work or remove the canopy without turning the lights off.
-Make a box out of eggcrate so that your animals don't disturb your DSB too much. Alternately, You could just make a support out of PVC and lay a single layer of eggcrate over the PVC, which essentially does the same thing.
-Duct tape of clip the powercord of your powerheads to something (I just tape it to the back of the tank), so that when the suction cups release the pump, it's not going to fall to the bottom and create a sandstorm because the cord is taped in place.
-Use a timer or alarm clock next to your RO/DI and set it 1min before it's expected to fill your bucket/container, so that your floors don't get flooded.
-Use 3/16" rigid tubing attached to a length of 1/4" tubing attached to a nasal aspirator (sucks a baby's nose and has a bulb at one end and a connection for 1/4" tubing on the tapered end) if a Turkey baster frightens your fish. Use this in the same way as a turkey baster or to precisely target feed frozen foods (such as mysis) one piece at a time. You can also use it to direct a stream to clean off detritus/sand from corals.
-Put your pumps on a different circuit than your lights (with backup pumps), so that if one circuit fails, you will can still rely on your reserve pumps/powerheads on a separate circuit.
-Put a ball valve about an inch above the bottom of a bucket or rubbermaid container and mix kalk in it. After 24-48hrs, just open the valve and fill as much kalk as you need without siphon hoses.
-Place a laminated piece of paper with the information of a reefer that you trust on the inside of a cabinet door. That way, if your family members or baby/house-sitter doesn't know what to do, they can call your friends and have them try to remedy the situation.
-Place a fluorescent light fixture inside the stand, so that you can see what's going on down there without fumbling for a flashlight or trying to bring in a bulky light see under the tank.