I wouldn't do it. By doing this, you are basically making your overflows into two sumps with the canister filters being the returns. the sump, in your case the overflows, are always the point in a system where evaporation drops the water level, and with a tank as large as 150 gallons, the water level in the relatively small overflows is going to drop fast. There can also be problems when running two overflows connected to two sumps. If return pump one is pumping faster than pump two but both overflows are set at the same height, than the stronger pump won't be getting enough water. What you could do is plumb your overflows into a single glass tank below and use the filters to pump water back to the tank.
Michael Rice
Marine Engineers Aquarium Blog
Sent from Tapatalk so excuse my poor English
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