will this work? Siphoning from tank to tank

[Dez]

You could also just t off your return pump and just have it trickle into the 6 footer and then run the drain to the cube drain. I have my frag tank set up like this. This way you are not adding any more flow so a larger drain is not necessary. Then just make sure you have a closed loop or lots of flow from powerheads in the 6 footer.

I have barely a trickle going into both of my frag tanks and just use Tunze's for flow in the frag tank. My frags have been doing well and growing for the past year and a half. Hope this helps.