PreDrilled Tank

[linbeg]

I bought a used tank from someone and they had the tank drilled on the top. I'm just wondering, how i would set it up into an overflow. Do i just use an elbow pvc? will be enough to act as a overflow? Or is there a better way?

 

[Ole Salty]

I have a 40 gal that was predrilled near the top and yes I connected an elbow to it with flex hose and it worked great, after a couple years I converted the tank back to freshwater and just turned the elbow a complete 180 so when I filled the tank I could made the waterline to the top of the tank. My guppies would love to go in and out of the hole like a cave.

 

[Pwny]

a 90 elbow will work fine but id rcomend getting a screen for it somthing like this Slip Bulkhead Screens so fish dont get sucked in

 

[linbeg]

Is it a good type of surface skimmer though? And will it be as effective an overflowbox?

 

[Pwny]

a overflow box is just there to prevent to much of your water from flowing out incase of a power out. a 90 elbow will do the same thing in a drilled tank if the power goes out it will stop draining because there is no more water being pumped into the tank to let it flow into the drain

 

[Pwny]

the screen i linked is just to keep larger items from getting into the drain

 

[dartmyth]

you could get a glass-holes overflow which is what i am going to do.
my tank is drilled in the back and i used a $1.00 plastic waste basket i got a a dollar store and cut down to use as a overflow box, but i want to use a bigger return pump and my overflow just keeps up with the one i got now. Also want to get a bigger sump and use the 20l i am using for a sump as a qt tank.