I had the same question when deciding on my tank upgrade. I went with a 120 because of the depth. Gives me greater options for aquascaping.
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--Chris
"Experience is simply the name we give our mistakes." - Oscar Wilde
Current Tank Info: 4'x2'x2' 120gallon mixed reef, 2x Radion Gen2. 40g breeder sump, oct-xs 200 skimmer
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