When I sealed mine, I asked on RC and at the local Woodcraft and Sherwin Williams stores. Based on recommendations from all 3, I went with a marine grade spar polyurethane.
I used plastic bathroom/kitchen tile as well as kilz paint and silicone at every interior joint! http://www.reefaddicts.com/entry.php...learning-curve
i just used Fast-Drying Polyurethane looking back it probabuly wasnt the best idea, if i ever have to pull out my sump i will reseal it with something better and more protective
This is true for every tank ever filled... but... set it up with water in it and pumps running for a few days. Drain everything and literally pick things up and move them around checking for leaks. Your silicone shouldn't go bad, so I wouldn't be concerned. Double check anyways though. I've never heard someone say, "man... I really wish I hadn't doubled checked that."
If the silicone is still stretchy or not brittle It should be fine the tank I have sat empty for 10 years before I set it up and not a single leak. I would assume that black silicone is the same way.
Just one man's opinion, but you should never match the return flow to your overflow rate. those flow rates are the max they can handle, if you pump water at the same rate and one gets clogged from a snail or anything else, then you have water on the floor. also the bigger the overflows are, the quieter and you won't need durso's for quieting.
Thanks everyone for your input. Looks like i'll be going with the Eheim 1262. Thanks Again.
How big is the sump? You don't want white water in blasting through your sump creating micro bubbles, salt spray and noise.
Eheim 1262 sounds right to me as well.
I have a 120g with about the same head pressure, I use a Mag18 but turned way down with ball valves, I estimate about 3-500 GPH turnover, which is right in-line of Marc's suggestion. I personally don't rely too much on the flow through the sump to count for much total GPH for water movement in the tank. I just have a skimmer and a refugium down there so no real reason to push so much water through. I would suggest the 1262 (which is a great pump by the way) and have the option to restrict the flow with in-line ball valves then to go with the 1260 and be under what you want. I too have 2 MP40's on opposing sides of the tank and they seem to do a very good job keeping the corals happy.
I'd forget about 3-5X tank stuff and get the pump that will match best with your overflow rating. In that case, the 1262.
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