Plumbing drain line

[Aquattro]

I never have...

[digital-audiophile]

I think I went overkill on my main tank and wasted a bunch of money I actually have 2 1-1/2" ball valves off there (one right off the overflow, and one going into the sunp -really should have used a union on there) thats ~$60 worth of valves :O

I am now plumbing in my frag tank and I will for sure use a ball valve on the return to throttle flow if required.

I am just hoping I am not making a mistake if I don't throw one on.. but then again I can always splice into the flex pvc line and throw one on down the road if I think it is required.. maybe just a union on there eh?

[Aquattro]

I always use a valve on my return pump, that controls the amount of flow draining from the tank. If you restrict the flow out and the flow in is greater, well, you end up swimming in the livingroom. I can't see any reason to have a valve coming out unless your drain is on the bottom of the tank. Which it shouldn't be.