I need to replace the bulbs on my tank pretty soon. I need 24 inch bulbs. Any suggestion on where to find the least expensive and best bulb to buy? Also should I get 1 10000K bulb and 1 Antic or should I get 2 50/50 bulbs? Or a combination of 10000 and 50/50? I need two bulbs to fit my 29 gallon tank. Corals are zoas, green star polyps, kenya tree, and xenia. Thanks.