I just purchased a 20x48 rimless tank and am looking at lightning. I am going to start out with lps and eventually get into sps. Would two hydra 26hds work or should I spend near double and go with two 52's? I thought I could always start with two 26's and add a third if necessary but then I'm near the cost of doing two 52's. The tank is 21 inches deep.
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