i found this on ebay, 12 bucks a peice, would two of these do good on a twenty gallon low light tank? i dont know anything about the brand and wether or not they are crap
http://cgi.ebay.com/BOYU-T5-8W-x-3-...emQQptZLH_DefaultDomain_0?hash=item29fecf9285
http://cgi.ebay.com/BOYU-T5-8W-x-3-...emQQptZLH_DefaultDomain_0?hash=item29fecf9285