return pump for 125 megaflow

[krowleey]

what pump would you recommend for this tank? also do you T your return for both overflow returns from one pump?

[doublejesus]

I've got an eheim 1260 for the returns on my 180gal, great pump!

[sacremon]

I tried a pair of Mag7 pumps initially, one on each return, and got a fair amount of microbubbles. I eventually chalked that up to cavitation - the pumps were supplying too much flow. I've replaced them with Mag5 and that is doing much better.

[krowleey]

<a href=showthread.php?s=&postid=14926521#post14926521 target=_blank>Originally posted</a> by doublejesus
I've got an eheim 1260 for the returns on my 180gal, great pump!

are you using a single pump for both returns? did you T them if so?

[GW81]

i have a panworld 100px-x on my 125. i feed both my return outlets, skimmer, and CA reactor off it.

[bradbmbj]

<a href=showthread.php?s=&postid=14927007#post14927007 target=_blank>Originally posted</a> by sacremon
I tried a pair of Mag7 pumps initially, one on each return, and got a fair amount of microbubbles. I eventually chalked that up to cavitation - the pumps were supplying too much flow. I've replaced them with Mag5 and that is doing much better.

The microbubbles probably came from too much flow through the sump where all the bubbles from the drain lines did not have time to rise and pop before going back into the pumps. Cavitation will happen irregardless of flow rate, it has to do with the impeller alone.

[krowleey]

so can anyone tell me if you run a single pump or 2?

[sjm817]

I'd use a single pump and T it.

[DDRR]

I use two Quite One 3000s, one for each return, works great so far on the 120gal

[krowleey]

<a href=showthread.php?s=&postid=14929514#post14929514 target=_blank>Originally posted</a> by sjm817
I'd use a single pump and T it.

how many GPH do you think on that ?

[sjm817]

I ususally go by 3 - 5x dispaly size. 375 - 625 GPH after headloss in your case. An Eheim 1260 would be in that range.

[krowleey]

thanks for the info guys. i'll order the eheim.

[ari5736]

I was running a Mag 18 T'd on my 125. Didn't like the extra heat so I drilled and installed a Blueline 55, and put eductors on the returns for stepped up flow (lots of it). Now I am running a Blueline 70 that also feeds my skimmer. Without the backpressure of eductors I'd go with a Blueline 40.