return pump

okay i need some help!
i have a 90 gallon saltwatwater community tank
a 30 gallon sump/refugium
i cant seem to get theright amount of water returning to my 90 gallon, it's either too much or too less,
the water entering the sump/refugium is gravity fed and the water returned is pumped!
i can't maintain a constent water level, so wut should i do? thnx jake

 

Use a ball valve to control the flow returning to the tank.

 

i dont have a ball valve but where would i put it?

 

Buy one at Home Depot. Put in-line between the return from the pump to the display tank. Adjust until the pump keeps pace with the flow into the sump.

 

are you using an overflow or is your tank predrilled?

 

my tank i thiink is an overflow!
it aint drilled

 

Does it have an overflow box hanging on it or is the glass drilled?

 

i dont have an overflow box or a hole
i have a hose that goes from my 90 gallon to my 20 gallon
if i get an overflow box would that control the water in my sump?

 

that is why you are not keeping a constiant level. yes you need and overflow box. make sure the rating on the box is close to the rating on the pump after the head flow

 

Don't worry too much if it's close, but just make sure it can handle more water then the pump. Ex. my return is a Rio2100, about 700 at 0" head, my over flow is an eshopps, at 800 gph. So in reality, I may only be getting 500gph out of my pump. But the way it works, as long as your over flow is greater, your pump won't run dry.