Hello! Welcome to reefing! I have owned several tanks over the years, up to a 180 gallon that I just sold a year ago when I relocated up here to yellowknife. If you have any specific questions I can help out through PM, or I can come over and take a look. To answer your one question, how big is the single drain you have? Although two is always better than one, usually tanks that size only have a single drain. You would have to get a diamond hole saw, and I left mine with all my tools in Ontario. Remember that if you add a drain, you are losing that much more tank when you add an overflow. If you find any more deals on tanks, let me know, I am wanting to start one up here bad!
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