09-01-2006, 05:37 PM
Join Date: Mar 2004
Location: Plano, TX
iTrader Positive Rating: 100%
I think the guy at the lfs is smoking crack. With the availability of so many various lighting options on the market height is not an issue. For scaping, tanks that have have depth are best. You probably notice how the 55 you have now limits you. A tank that has a 2 : 1 : 1 ratio in length : width : height tends to offer the best looking scapes. Such as 36x18x18 or 48x24x24
Height really becomes an issue when going over 30" tall. It's hard to reach the back without a stool unless you have quite long arms. Ground cover plants such as HC and glosso would need a light with a lot of punch in a taller tank like that as well. However, going the El Natural route you generally would not use plants such as those.
A 90 like that would seemingly do well with approx 180 watts. Easily accomplished with 2x96W PC.