Yea, I am concerned with how I will clean the sand with a 4ft deep tank, also its strange to me to have a bulk head on the bottom of the tank, just worries me I guess. There aren't suppose to be holes in m tank!
No need to have holes on the bottom of your tank. I don't know if your tank is going to be free standing, or abut against a wall on one end. Either way, an overflow box can be used without compromising esthetics too much. Here are three pictures taken from Midwest Custom Aquariums' gallery. No holes in the bottom of the tank, all plumbing confined to the overflow box or under the canopy.
http://midwestcustomaquariums.databae.net/photo-gallery/acrylic-tanks-with-cabinetry/



I, too, am very leery of holes in the bottom of the tank. I prefer holes in the top of the tank. In lieu of bare bottom, some people have put tile on the floor of their tank. A few have used a low profile rocky background on the floor instead of substrate. .....Albertan
http://www.monsterfishkeepers.com/f...for-Dummies)&p=6569462&viewfull=1#post6569462


