Center of the Tank Overflow

[SanClementeEric]

I picked up this 300 gallon tank and was wondering what the best method of setup would be for the overflow, plumbing wise.

The overflow sits in the direct center of the tank, so fish can swim on either side of it.

It has four 1-1/2" holes drilled in it now. The last owner used one for a dry line for wires.

 

[ragin_cajun]

You could do a Herbie. Single return line from a single pump. 2 siphon drains, one dry backup/emergency drain. Plumb the 2 siphon drains to a gate valve. I think that'd probably work.