Michal Majewski wrote in message
...
Wattage isn't the problem, it's the spectrum. Best for plants is
between
about 5000k and 7000k. With 150w @ 10000k you will, however, grow
exceptionally lush algae.

Ok, if You say so... I will buy 5200K NH bulb. What about wattage? Is it
ok,
or too much for this tank?
It will be any difficulties if I put 150W instead 70W?

Wattage should be OK. I use more watts than that, myself, but in tubes so
it's more diffuse. Note that 5200k will look a whole bunch more yellow-ish
than what you've been accustomed to in a marine tank and do not freak out
the first time you plug it in. You will get used to it and freshwater
plants look great under it.

kush