The link doesn't take me to any thing specific, so it's hard to give advice based on that.
For that tank, I would recomend a 55w, compact flourescent retrokit from AH supply.
It would light the whole tank pretty well without bringing the temp up too much.
As far as more small lights being better, when you're talking compacts, once you get up to the 55 watters, they are much more effecient than the lower watt models.
For example: A 36w compact is said to produce 2400 lumens, (66.666 lumens per watt)
A 55 watt compact produces 4800 lumens (87.272 lumens per watt)
See the difference?
For that tank, I would recomend a 55w, compact flourescent retrokit from AH supply.
It would light the whole tank pretty well without bringing the temp up too much.
As far as more small lights being better, when you're talking compacts, once you get up to the 55 watters, they are much more effecient than the lower watt models.
For example: A 36w compact is said to produce 2400 lumens, (66.666 lumens per watt)
A 55 watt compact produces 4800 lumens (87.272 lumens per watt)
See the difference?