I'm a pretty big fan of a 30" deep tank. My last tank was a 30"er and I loved it. I can reach the bottom but I have relatively long arms. If I'm going to spend a long time in the tank, I just wear a sleeveless shirt and it's not a big deal. I also use aqua tongs if I'm just moving a few items. To me, the extra 6" in height makes a significant visual impact vs. a 24" deep tank, and is well worth the extra effort, if there is any. Just my .02