The Oscar Overflow "OO"

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Windy

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I have recently gotten into fish breeding. I had to choose a set up and decided on 20 gal. high aquariums for my breeders. I have the water coming in over the top of these tanks, but 2/3 of the way up on the back wall I have drilled a hole to accommodate a ¾” pvc pipe thread bulkhead.
I want my tanks to be overflow style to help remove food and oils. I also wanted a very reliable overflow with an emergency drain. So here is how I set it up and if you like the idea they are simple to make. They may not be what you want for a display, but for a fish room they are easy to make and reliable.
Here are the materials:



The 2” coupling is slotted 1 ½ in deep with a table saw and then the mesh is glued over the top.
This example is of a frag tank, bur it shows the overflow in profile:


 
These overflows are not made for noise control. I use them in a fish room. They will handle 400 gph or more for the 3/4" drain. You can use them on 1" or 2" pipe with additional volume. Remember, if the flow increases, the flow out the slots gets higher and increases as well.
 

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