The light came with another tank I have had for a long time and I just remembered I had it. I am no where near adding any coral but I was trying to get an idea of how much more money I need to get there.

It has blue lights in it now and if I were to buy 50/50's they are $45 each so since it won't work 4 much I am just gonna put the money towards a better light.
This is a little off topic but I am still new at this. How many gallons of water should I change each week with a 55? I only have 2 damsels and it has been cycling for about a month now.