What size return pump would be best for a 120, currently what i have is a mag 12.I don't want to move water to quickly through my sump.The sump is a 40 gallon long. THANKS
Before you choose a pump you need to know what the drain capacity is. Obviously you don't want to exceed its abilities. You also want a healthy margin of error ( i.e. a good bit more drain capabilities versus pump output.)
Internal pumps are easier to plumb and service and take up less room in the stand but are usually of lesser quality (not always the case) and use the surrounding water to cool them. Which means they add heat to the system and in some cases this can be pronounced ( keep this in mind when adding internal powerheads.)
External only pumps are generally of higher quality, take up more cabinet space (they do free up sump space), require more external plumbing and can be harder to service if the plumbing is not thoughtfully executed. They usually are fan cooled and contribute less heat to the system (this is not always the case as well.)
By using a smaller pump as a return you will reduce the likelihood of air bubbles being returned back into the tank and increase the contact time in the sump for the skimmer, chemical media, ...etc. You will also reduce the likelihood of unpleasant noise production from your drain. If you choose this route water movement will need to be augmented by other means as mentioned above.
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