How Much Water Flow

[carspa]

Hi guys i have a marine tank 120l I have just added my first coral Some star Polyps. They opened up great. Question is how much water flow do i need

 

[Aquascaper]

Different corals require different flow rates but as a general guide x30 - x40 tank volume is quoted.

This would mean the total of all pumps and powerheads in your tank should be equivalent to at least 3600lph - 4800lph.

 

[carspa]

Different corals require different flow rates but as a general guide x30 - x40 tank volume is quoted.

This would mean the total of all pumps and powerheads in your tank should be equivalent to at least 3600lph - 4800lph.

Thanks For your help really appreciate it

 

[vanny]

gsp does fine under most flow conditions, but it prefers moderate flow to prevent algae from forming on top of it.
so for a 120 litre or 30 gallon tank you can be fine with getting 400-800 gph power head
(just a side note - if you have too much current some of the smaller fish may have a hard time getting from one side to the other) but you definitely need the fr both circulation and the corals

cheers