Lighting...

[raytan12]

My tank water volume is 90cm x 30cm x 30cm...
I have 2 units of (36W X 2). Is it too much light-6.7WPG?
if 1 unit of 36W x 2 which gives 3.4WPG is it enough for plants that require high light?

[tawauboy]

you can start with 36w x 2. observe your plants. if they are not growing well, add more lights. you can always remove one tube from your light set.