T5 for biocube

Unfortunately no. The smallest standard bulb size for reef aquarium use is 24 watts which is 21" or so in length made to fit 24" T5 fixtures. I believe a company like Coralife or Current used to make an 18 watt T5 bulb but bulb selection was definitely lacking as none of the big name reef aquarium bulb manufacturers like ATI, Giesemann or KZ made bulbs if that size.
 
Biocube makes a two bulb t5 fixture for refugiums its smaller than the 21in bulbs I believe its 12inches. It may fit
 
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