I have a ladder... One to get to the top, and one to get to the bottom of the tank Hahahah. My tank is a inwall in a alcove of our house. We did millwork false front, the light rack moves back and allows me almost 30" clear to the ceiling.. I can stand in the tank if need be. By laying on top I can reach to the bottom 4-5" and tongs do the rest. I would never have a tank less than 36" deep. Long shallow tanks seem so stubby. I can access all sides of my system.
Happy Reefing