Help with lighting please!

I have 20 gallon long saltwater tank and i was using normal light bulb and i did upgrade lately to this people in pet store said that this light is good for growing corals i really don't know anything about it just i know it 55 wat it's better because my old bulb was 15 wat anyway this light comes with blue and white bulb maybe its t5 light i don't know anyway i hope i will get some replies
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and this is the bulbs



And this is information about the light in the link below

http://advance-reef.com/home/index.php?option=com_content&task=view&id=639&Itemid=138

 

anyone help?

 

That light will be fine for soft and most LPS corals. While I can't speak on the brand, a 2-bulb T5 is exactly what I'm using on a 20L tank.

 

Okay but when i can start adding ? corals my tank has been running for 2 months?

 

When you're sure your cycle is done. One thing even easy corals won't tolerate is an ammonia spike.

 

My cycle is 100% done