Overflow Rating Question

  • We are currently upgrading MFK. thanks! -neo
Thank you everyone for all of your replies, I am admittingly a little overwhelmed. No idea what a 'herbie' system is, hard to figure out by reading that thread because I guess I am a complete novice when it comes to plumbing.

Upon further measuring, I have found that my glass-holes are 1.5" and the previous owner had them installed with bulkheads with an inner diameter of 3/4".
 
I stand corrected. The glass holes are 2" each. It was a little hard to measure them, as they are upside down and inside the tank, so please forgive me. The previous owner was only using the over flow as one hole for send, one for return, and on his return it had a 3/4" pvc.

I plan to use both holes as drains, so hopefully with a wide enough bulkhead, I can keep them around 1.5" each for drain, then plumb my own separate pvc return pipes along the back of the tank.

I think I am going to go with (2) seperate Mag12's for the returns. I think it will match my drainage rate nicely.

Thoughts?
 
Too much flow IMO. You don't need to run 10x tank volume through a sump. Waste of money and electricity. You don't need to match your drainage rates. You just need to make sure your pump runs less than the max your drains can handle. You can pump 100 gph through drains that are capable of doing 1000gph, but not vice versa.

10x turnover gets too much hype
 
That really won't be close to 10x turnover and sounds reasonable since you'll be using all 4 bulkheads for drains.
 
landmineyouth said:
No no, theres only 2 glass holes drilled, which = 2 bulkheads
Click to expand...

Oh... I can't speak from experience on 1.5" drains, but everything I've read suggest that that might be a bit too much flow for two drains of that size.
 
swk said:
Too much flow IMO. You don't need to run 10x tank volume through a sump. Waste of money and electricity. You don't need to match your drainage rates. You just need to make sure your pump runs less than the max your drains can handle. You can pump 100 gph through drains that are capable of doing 1000gph, but not vice versa.

10x turnover gets too much hype
Click to expand...

Curious as to the negative aspects of more turn-over, beyond if I plumb it wrong that i'd be sucking the tank dry. Im planning on keeping an Aro in here with possibly a pair of oscars or some large dats, all through there adulthood. More filtration the better?

I could see that if the flow was SO strong that it shoved the fish against the glass, sure... thatd be bad... haha
 
Okay... so are the plastic bulkhead fittings 1.5" on the inside where the water goes through? That is what's going to determine the amount of flow you can push through the drain. I somehow got the impression from your previous post that the holes in the glass are 2", therefore the bulkheads would still need to be installed.
 
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