What would be the best size return pump for a 93gal display w/ 30l sump. The sump will also house an ATB 840. Thanks
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If you are going with a internal, then I would look at a Eheim 1260.
Sometimes those mags can be a little noisey, and it is going to be a little more flow than what I would pick.

Thanks for the reply. Maybe ill just save myself the headache and get the 1260. Last ? i think ......If i do get the 1260 how would i have to connect it to my SCWD which is for 3/4" tubing. Dfs says the 1260's output is 5/8th". Sorry if its dumb ?... i have never had to set up the plumbing for a tank..My experince with mag pumps ( I've had 3's, 5's, 7's, 9.5's, and 12's) tells me that while they may (or not) start out as acceptable for noise, that within a few months or so they start getting louder, until one day you wonder where all that racket is coming from. The mag 12 I had was used for a external closed loop pump for 10 months, until it woke me up early one morning.
I would think that with your plans to use a mag you already own is a great way to save a few $ for now, but if it does get to the point you want a quieter pump, look at the eheims.
I think you would be in the area of flow you would want with the mag 7
give it a try, it may be perfect.![]()

