Silicone the bulkhead and hand tighten only. Nice and firm without really reefing on it; you don't want to crack the bulkhead or the glass. When you're plumbing the drain line, be sure to put a gate valve on the line so that you can regulate the amount of water coming from the overflow. Also a good idea to plumb unions wherever you may need to remove something at a later time (pump for example) The flow through the sump can be quite slow so a large pump is not needed. Try to match one fairly closely to the overflow drain rate. This is where the gate valves come in. You can regulate the flow exactly. Hope this helps.
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225g reef
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