Nova Extreme Pro 20. Time for new bulbs. Need your help

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I have a NEP 20 and need new bulbs soon. Should I buy the UVL and modify the length or go with the truelumen? What type of bulb array should I get also?

 

My tank is a 24g nanocube. The NEP holds 6 bulbs 18w. The tank is just zoas, GSP and planning on getting some ricordeas.