New reef tank with hole in overflow

[JJ-MIK]

Here's what they look like

 

[mr_X]

There are two layers of plastic with a air space in between. The hole was cut through both layers of plastic. Suppose each hole needs sealed up individually or don't worry about that?

Only the inside hole has to be plugged. Just so long as the water needs to come over the top and through the surface skimmer teeth, you will be fine.

 

[cainboy]

Only the inside hole has to be plugged. Just so long as the water needs to come over the top and through the surface skimmer teeth, you will be fine.

Ok, thanks. I wasn't sure if the air gap was wide enough to allow unwanted visitors to enter.

 

[mr_X]

Air gap?

 

[cainboy]

Air gap?

The air gap between the two layers

 

[mr_X]

That will be full of water soon enough...lol.
It doesn't matter if critters get in there.

 

[JJ-MIK]

But if fish can fit... They will take a ride to the sump.

 

[mr_X]

How so? They still have to navigate the surface skimmer teeth.

 

[JJ-MIK]

If you look at the pic. The first wall is wide open with that hole. If it goes in there.. The hole.. it will go straight to the top on the back side of the teeth. Drop into the back side and to sump..

 

[mr_X]

I don't see it. Then use your own discretion cainboy.
What I'm saying is that little area between the two panels is fine to have whatever live in.

 

[JJ-MIK]

Ya. Those type of overflows are double walled so water can go through 3 sections of teeth . Low middle and top section. That way since its double walled anything that enters that hike he has... Say a small gobie. It will get sucked up to the top and into the sump..

 

[CorallineAlgae]

Definitely. It's worth sealing up both the inner and outer walls if possible.