Cheap blue light fixture

sen5241b

Reef enthusiast
I meant "cheap"
I'm looking for about 20 to 30 watts of cheap blue light (approx. 420 NM) for a small tank. It seems like most fixtures are geared for much boigger tanks. Got any ideas for a fixture?
 
I have a 20 gallon FOWLR and I want coralline to cover everything. My other 20G long has 1 35 watt blue actinic and 1 35 watt white CP and the coralline has covered almost every piece of rock in the tank and the cal and alk have been chronically low! I am convinced blue light (apporx 420 NM) is the secret to growing lots of coralline.
 
Here it is: [ame=http://www.amazon.com/gp/product/B003XNFCA4/ref=s9_simh_gw_p199_d0_i2?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-2&pf_rd_r=0WFC35TCNM7PF4B2GZJ7&pf_rd_t=101&pf_rd_p=470938631&pf_rd_i=507846]Amazon.com: Finnex 26W Blue White Energy Saving Coral Plant Refugium Bulb: Kitchen & Dining[/ame]
 
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