Overflow for a 20 long

[bluehusky424]

Hey everyone, I did some research (quite a bit) and decided to go with a sump for my first reef build. I am looking for recommendations for an overflow that will not take up too much real-estate in my tank, leaving more room for swim space and scape space. I am also looking for the calculation to get how many GPH I need, I know I can control it with a gatevalve. The sump will be made from a 10 gallon I have laying around.

 

[MrGisonni]

This overflow has been awesome on my 30. You do need two holes drilled however.

 

[bluehusky424]

This overflow has been awesome on my 30. You do need two holes drilled however.

I have seen/heard good things about that style of overflow

 

[MrGisonni]

For whatever design reason...the return flow fluctuates a bit adding some randomization that creates a slight wave pattern in the aquarium.

 

[bluehusky424]

For whatever design reason...the return flow fluctuates a bit adding some randomization that creates a slight wave pattern in the aquarium.

I think it might be due to the nozzle, as there are randomized flow nozzles on the market.

https://www.bulkreefsupply.com/rand...D=7132&indexName=brs_prod_m2_default_products

Like this

 

[MrGisonni]

I think it might be due to the nozzle, as there are randomized flow nozzles on the market.

https://www.bulkreefsupply.com/rand...D=7132&indexName=brs_prod_m2_default_products

Like this

It's a strange phenomenon that happens, the nozzle doesn't have those venturi ridges inside.

 

[bluehusky424]

It's a strange phenomenon that happens, the nozzle doesn't have those venturi ridges inside.

Ah, ok, I dont know what could cause that then