To much light?

[Michael Covi <thebaron22 at optushome_com.au>]

Hi everyone,

I have a 24x12x16" tank with 2 x 20W lights and the tops of the plants were 
turning a red/brown colour. I removed one of the lights and they have 
recovered and are nice and green again. I had no co2 injection, kh of 4 and a 
high ph. There is a soil substrate covered with river gravel.

I have since been lowering the ph. Can one have to much light? What is likely 
to be happening? I am assuming i must be low in co2.

Thanks this is a great group.
mick

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