700 GPH too slow?

[iceburger]

I have a magdrive 7 that will be my return pump for a 75 gallon reef, is this pump too small for my return pump, I will have like four or five different powerheads in main tank...

 

[mr . salty]

Should be about perfect for a 75...With the powerheads you may even end up with too much water movement in there.
Two powerheads should be enough,,,but you never know for sure till you try it...

 

[broomer5]

Sounds pretty close to me - but if I may ask - what size and type of overflow are you planning to use ?
Drainline size and sump size ?
It's normally best to look at the tank size ( 75 gallon ) and the overflow/drainline/sump/return pump as ONE package.
One choice is determined by many.

 

[danrw84]

if you're getting rid of the mag7 , its just what i need! let me know

 

[iceburger]

the sump is i would estimate it at maybe 20-30 gallons...
sorry danrw, i just bought it...theres someone on the classified page selling one for $50

 

[josh]

It does sound about right, how far are you pumping the water back up to? I would guess something like 4 feet or so. You can always put a check valve in the return to throttle the pump back a bit as needed.
HTH

 

[iceburger]

yeah it'll be clost to 4 feet up...