Since we've started discussing the Coralife T5HO, do ya'll know what kind of freshwater fish (since Tetras like the blackwater/forest setup) that thrive in high or bright lighting?
None really. Marine (ocean) fish live in open water but sunlight does not penetrate all that well through water. Blue light has the greatest penetration, which is why marine lighting units are so high in blue (actinic light for example); this is needed to keep corals alive. Red and green light penetrate considerably less well. All of this is also why it becomes rapidly darker the further down you go in the ocean, or even freshwater for that matter.
There are rivers in the Amazon that are in direct sunlight; these are the only watercourses with much in the way of aquatic plants, and all of them without exception have floating plants along the banks. When you look at the fish in those rivers, not surprisingly they all live along the shores, under a "roof" of either floating plants or overhanging terrestrial vegetation. Streams and creeks in the forest may never see direct sunlight because of the forest canopy; and during the wet season which lasts half the year, when the watercourses flood the surrounding forest for thousands of square kilometers, the fish move into these food-rich but dimly lit waters to spawn. The point in all this is that for the vast majority of freshwater tropical species, direct overhead light is something they rarely if ever experience their entire lives. Their eyes have therefore evolved to function in such an environment.
I have seen evidence of this preference to avoid overhead light in my own tanks. All have floating plants--I consider these as essential in almost any tropical aquarium--but it is not surprising that when I periodically thin them out due to excessive growth, for the next several days until they grow back some, the fish will not bee as out and about as otherwise. This is a direct relation to the overhead light. And if you have ever noticed in photos of the beautiful aquascapes designed by Amano, all the shoaling fish are down among the plants in most of the photos; this is because they avoid the overhead light which is bright. On the planted tanks forums you will find a majority of aquarists that have high-tech planted tanks but with few and often no fish at all.
Byron.