Originally Posted by Hoppy
Any T5HO light that sits on top of a 20 gallon tank will be too much light for a "low tech" tank. Even 2 bulb T5NO lights will likely be too much for a 20 long tank. You can't compensate for the high light intensity by just running the lights for a shorter period. Light isn't cumulative to much of a degree.
Thx Hoppy. The T5 light came with a couple of brackets that can be used to raise the light up and away from the tank a bit. Do you think using them will lower the intensity a bit? What signs will I see if the plants are getting too much light? What should I watch for? I am all ears.
Thanks in advance.