How Many Gph Do I Need?

[kingspade]

i have a 125 gallon and was wondering how many GPH of flow i need in this thing, i keep hearing around 200, but maybe only that much is needed to keep SPS? also if i need about that mcu what are the best powerheads to achieve this? also i am going to be building a refugium out of probably a 20-30g long, what are some GOOD overflow boxes for me to look into getting?

 

[trainfever]

It depends on what kind of tank you intend on having. If its fish only, then you will need a gph of 10x your volume or 1250 gph. For corals, you will need 15-20x your volume.

 

[squidd]

i keep hearing around 200,
I'm thinking more like 2000....10 to 15 X tank volume turnover...
Double that when you get into SPS...

 

[kingspade]

i was thinking of getting 4 sieo m820 powerheads those are 820 gph each, plus whatever return pump i decide to go with added to that just the sieo' will get me to 3280. i do plan on keepin sps in there also

 

[kingspade]

if i go with the cs100 overflow box which is 800 GPH what size return pump should i use?

 

[squidd]

Mag 9.5 with 1 1/4" return line...