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I just purchased an Oceanic 180g. This comes with 2 HUGE overflows and 4 holes on the bottom of the tank. My current plan is to remove the two 9x11x24 overflows, drill the back of the tank and install a coast to coast and use a Bean fail safe. 1. Do I need to set up 2 sets of bean meaning 6 holes plus the returns or will one set suffice? Right now my intent is to have a mixed reef but don't want to be limited later down the road by low flow rates. 2. The holes on the bottom scare me. On the forums I hear too much about cracked bulkheads. It seems that would be catastrophic with the bottom drilled as opposed to only losing a couple of inches of volume if repair was needed. What are the options? Can I just take a 9x11x ½” slab of glass and silicone it on top to close it off? 3. What are the advantages/disadvantages to internal/external overflows? Any other suggestions are also welcome. Thanks in advance Bevin
