Radiums are by far the most popular and the performance cannot be matched. However, like anything in life, you must be aware of the drawbacks. More specifically, Radiums should be changed every 6-8 months.
Primary Goal:
Growth - 6,500K - 10,000K
Color - 14,000K - 20,000K
Generally when I run a SPS reef, I use Iwasaki (6,500K) or XM 10K to grow out the corals for 1-2 years and then switch to Radiums to color up the corals.
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Current Tank Info: 300g DD, SPS dominated, Apex, Tunze 6125s, ATB 1050, 400w MH, and Geo 618 Ca Reactor
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