How many GPH for 135 gal. tank?

Thanks, that helps, I wouldn't want to compromise the pump by putting on a valve to reduce the flow.  I did, however, buy some pressure pvc with a ball valve and other fitting yesterday at Menards (which I envisioned as looking very professional once installed, lol) but I'll take it all back today.  The rise is 4-5 ft. with a 3/4" hose coming from the pump reducing to 1/2" going into the tank.  I'll give it a shot to see how it goes.
Mike

I would use it. Once you plumb in the pump it won't be pushing 1800gph. Head height and pipe size will probably draw it down to 1000gph or a little more. If it still produces too much current grab another pump. Restricting a pump with a valve can put undo stress on it and cause it to fail prematurely.

Just see how its goes, you only need a minimum of 540gph for that tank to be at the 4x turnover per hour rate.

My 210 I use a aquapro 300 wet/dry with twin model 12 magdrive pumps, in conjunction with a eheim pro 3 2080, the twin 1200's dont put out alot of flow, the eheim puts out far more pressure then the magdrives do.

I have a 135 gal tank with a wet/dry sump rated for 200 gallons and a 1800 gph pump.  I haven't filled the tank yet but I was thinking that 1800 gph might be a bit much as far as the turbulence in the tank and the return volume to the sump.  I was wondering if a ball valve would work or if I should go with less gph, or maybe just try it and see how the flow goes.  Any advice appreciated.  Mike