Plumbing into an existing tank

[svreef]

I plan on plumbing a new tank into my existing tank.

Can I use flex PVC for both drains and the return? Any caveats?

I have a second return pump already feeding my UV - can I just send it’s output to the new tank?

How do I know whether my sump will handle the overflow of the additional 22g when the return pumps are off?

Anything else I should think about?

 

[Coral reefer]

Yes to all. One sure way to find out if sump can handle it...

 

[svreef]

Yes to all. One sure way to find out if sump can handle it...

Bring a bucket and a mop.

 

[Coral reefer]

Bring a bucket and a mop.

Or just be ready to turn the pump back on real quick and figure out what to change

 

[RandyC]

I plan on plumbing a new tank into my existing tank.

Can I use flex PVC for both drains and the return? Any caveats?

I have a second return pump already feeding my UV - can I just send it’s output to the new tank?

How do I know whether my sump will handle the overflow of the additional 22g when the return pumps are off?

Anything else I should think about?

You can use the UV pump as long the flow rate matches the turnover you want in the 22gallon tank. If it doesn't, you'll need to build a manifold with a tee.

Run the 22gallon tank to a temporary bucket or tank and measure the amount of water that drains when the pump is turned off. Do a rough calculation of empty space left in sump and see if it matches up.

 

[max_nano]

Could this work?
Plumb in the second one. Measure water height when both pumps running, turn pump 1 off and measure delta. Then turn pump 1 back on, turn pump 2 off and measure delta.

If d1+d2 > sump height, get a bigger sump?

 

[svreef]

Could this work?
Plumb in the second one. Measure water height when both pumps running, turn pump 1 off and measure delta. Then turn pump 1 back on, turn pump 2 off and measure delta.

If d1+d2 > sump height, get a bigger sump?

Very clever