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Hey there. I would have to advise against using the canister filters in SW tanks. unless cleaned constantly the same stuff that it traps breaks down releasing nitrates back into the water.


As far as a sump goes..that solves both of your problems. You get the filter with your skimmer area and settling tank. The added water volume also helps keep everything a little more stable. Your heaters and thermometers can be kept in there as well.
 

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+1 go with the sump, not only is it a good place to hide all your equipment but it will also help with gas exchange.
 

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Aquatic Philosopher
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sump
 

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Aquatic Philosopher
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Eheims are the best, Magdrives are a good value for a bit less. Rios are not quite on the same level of quality. What you want is a pump that will turn over the tank about 4-7 times an hour so a 90 + sump volume (lets just say 20g) would need a pump that is about 440-770 gallons per hour. Note, this must overcome the head pressure of pumping against gravity, so follow the pumps instruction about head-loss. For instance, a pump that is rated at 960 gallons might only pump at a rate of 450 gallons at 4 feet of head pressure. I generally recommend using as small of a pump as possible as there is not added benefit for blasting more than about 7X the flow per hour through the sump.
 
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