Strainer on Durso

[Jasonrusso]

I recently built two 1 1/4" durso standpipes for a 150 gallon Fowler. I currently do not have any strainers on the intakes. Are they really necessary?

[T1KARMANN]

Depends on the size of your fish

My fish are to big to get sucked in but if you have smaller fish I would add them or your fish will start to go missing and you may need to hook them out of your sump and put them back in the main tank

[Jasonrusso]

I do have "teeth" at the top of the overflow box. I think my fish are too big to fit between the top of the box and the top of the tank.