too much light?

[fishingaddict]

i think i have too many lights over my tank.. how do you kno when youve cross the line?

i have a 2ft and 4ft runnin like this.. then two more 4fts bought 8 inches above the tank. tank dimensions are 7ft x 2ft x2ft

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[Boydo]

If your fishes backs start to get burnt or darkening in color.