Is this too big of overflow to fit return holes?

[Cichlid Dad]

I'm not a "clean everything" fanatic, my concern would be algea/coraline or a snail blocking the hole. But yes this is the prevailing solution

There are a few failure points on a reef tank that needs inspection every few days, this is easy to accomplish.

 

[Reefering1]

There are a few failure points on a reef tank that needs inspection every few days, this is easy to accomplish.

Doesn't have to be this way. My tank can be left alone for a month or so without input from me(besides feeding and glass). But yes, you are correct. they are high maintenance, more reason to design it with as few points of failure as possible; from the beginning

 

[Bakedpwn]

Just keep in mind, when the pump is off, the water(in the display) will siphon back to the sump to the level of return outlets. Check valves are a option but they reduce flow and add a possible point of failure and maintenance. Mine are just under the surface. When the pump stops the siphon stops and water level is right at the overflow height

Ok ya gotcha

 

[Bakedpwn]

I think im gonna run it. Go with dual over the top custom pvc to 3/4 RFG nozzles

 

[Reefering1]

I think im gonna run it. Go with dual over the top custom pvc to 3/4 RFG nozzles

While you're at it, give the return pump chamber size some thought. Smaller is better, but not too small to leave no room for future alterations. Mine is about twice the size of the pump. I can do dual pumps if I choose, but more importantly, the pump will run out of water before it can overflow the display(in the event of complete drainage blockage). I've tested it, using my hands to block drain pipes and it gets about 1/4" from the top, pump runs dry and shuts off. Nerve racking during testing but it works and nothing can take that piece of mind, except maybe the ato. But I'm working to resolve that possibility

 

[EeyoreIsMySpiritAnimal]

I understood this is a three hole drain. If yes then there is no reason that a Bean couldn't be turned into a Durso which would be two drains. If it is a Durso model to begin with then I would not turn it into a ONE drain hole.

BTW there is no need for your laughing at someone.

Nope, incorrect again.
A two drain overflow is a Herbie.
A "durso" standpipe can be used with a Bean and is used alone on a single drain, but IMO, a durso is a waste of time if you have more than one drain.
On a Herbie, you need 1 full siphon (which is not a durso) and 1 open emergency drain.

 

[Bakedpwn]

I think ill be getting a smaller overflow so i can do drilled and be safe and secure.
I hit up modular marine for exchange or return.
I reallllllly like this overflow so i think ill try to get the 800gph version

 

[Bakedpwn]

While you're at it, give the return pump chamber size some thought. Smaller is better, but not too small to leave no room for future alterations. Mine is about twice the size of the pump. I can do dual pumps if I choose, but more importantly, the pump will run out of water before it can overflow the display(in the event of complete drainage blockage). I've tested it, using my hands to block drain pipes and it gets about 1/4" from the top, pump runs dry and shuts off. Nerve racking during testing but it works and nothing can take that piece of mind, except maybe the ato. But I'm working to resolve that possibility

Great tips i hadmt thought of. What kind of pump do you have that shuts off when dry?

 

[Reefering1]

Its just a jabeo, their biggest available. But I believe all, good, dc pumps have run dry protection

 

[Brett7397]

I am using an Eshopps M on my 75 gal. It's a two drain overflow. One drain for flow and the other for emergency. It is rated at 800gph. You only need about 3 to 5 times tank volume for turn over. Unless you have alot of bio load you might need more. I am going to figure on 300 to 400 gph for my 75 gal.

 

[Brett7397]

Just keep in mind, when the pump is off, the water(in the display) will siphon back to the sump to the level of return outlets. Check valves are a option but they reduce flow and add a possible point of failure and maintenance. Mine are just under the surface. When the pump stops the siphon stops and water level is right at the overflow height

Placing them just under the surface will also help with gas exchange.

 

[Bakedpwn]

I talked to Modular marine and im using half inch returns. should have enough room to do two returns so i drilled today!
results

 

[RocketEngineer]

I talked to Modular marine and im using half inch returns. should have enough room to do two returns so i drilled today!
results

Looking at what you have, I question their advice. BUT, there’s a solution.

For any hole you drill, you need that hole diameter of glass between it and any other “edge”. So, if you drill two 50mm holes, you need at least 50mm from the edge of the glass or 50mm between the edge of the holes. Preferably more.

So take the glass hole saw and a sharpie, mark where you want it, then run the hole saw around the outside of your mark. If you come close to a bigger hole, you need to use the larger spacing.

Hope that clears up any question.

 

[GlassMunky]

Anyone ever use this?

I used these for years. Just get these and be done.