A TV stand to support a 110 gallon tank? Sounds like disaster. Most tv stands are built to support 200 maybe 300 at the most (don't know exactly, but I know it's not a lot). Water weights about 8 lbs a gallon, plus say 110 lbs of rock, 100 lbs sand...you're looking at around 1000 lbs to be supported by a 3 tier tv stand. Definitely look into building or buying an aquarium stand that can support the weight and have room for a sump.
“Success is walking from failure to failure with no loss of enthusiasm.”
- Winston Churchill