Hi. I have a new 75 gallon tank with holes drilled out for an overflow box. I purchased and installed the 1200gph modular marine overflow box and am having trouble with the plumbing in the box due to extremely limited space and was looking for some advice. I am trying to limit the amount of noise coming from the overflow and was hoping to use the Bean Animal setup since the box has 3 overflow bulkheads.
The first issue with the box is that the overflow bulkheads are 3/4". I was told 1" was the appropriate size for this setup and to use 3/4"-1" reducer right after exiting the box. Am I correct in thinking that having this increase in size will cause issues with the full syphon line? I could always leave that line at 3/4" and just make the secondary and emergency drains increase to 1".
The second issue is space. Two of the three overflow holes are located right under the threaded bulkhead that connects to the tank leaving about 2.75" from the bottom of the overflow box to the bottom of the bulkhead which means this is all the space I have for 2 of the 3 pipes. Here is a picture of what it currently looks like. There are two straight 3/4" pipes for the overflow that go up to the bottom of the tank bulkhead threading and one emergency overflow in the middle.
https://imgur.com/a/lPAmgBg
The way I see it I have a couple of options:
Option 1 is to do a bean animal style overflow, similar to this https://blog.marinedepot.com/wp-content/uploads/2017/08/bean-animal-2.jpg, but with some modifications to make it fit. First the primary drain (full syphon) will be a low profile strainer that is pretty much flush with the bottom of the overflow box. Then the secondary drain would be a very short tee with cap (doubt I could fit the 90) that fits under the bulkhead threading. The emergency would have to be in the middle since that is my only option. My main concern with this setup is if the secondary drain being so low will be a problem. Also, if I went this route should I just keep the 3/4" for the main or should I try increasing it to 1" right away?
Option 2 is to use a herby style overflow, similar to this https://blog.marinedepot.com/wp-content/uploads/2017/08/Herbie-1.jpg, but use both the left and right drains as the primary drains and then keep the middle as the emergency. Will that even work to have 2 primary drains both acting as full syphons for this type of setup? Again, should I keep both primary drains as 3/4" or try to upsize?
Thanks in advance for your help and any other suggestions are welcome!
The first issue with the box is that the overflow bulkheads are 3/4". I was told 1" was the appropriate size for this setup and to use 3/4"-1" reducer right after exiting the box. Am I correct in thinking that having this increase in size will cause issues with the full syphon line? I could always leave that line at 3/4" and just make the secondary and emergency drains increase to 1".
The second issue is space. Two of the three overflow holes are located right under the threaded bulkhead that connects to the tank leaving about 2.75" from the bottom of the overflow box to the bottom of the bulkhead which means this is all the space I have for 2 of the 3 pipes. Here is a picture of what it currently looks like. There are two straight 3/4" pipes for the overflow that go up to the bottom of the tank bulkhead threading and one emergency overflow in the middle.
https://imgur.com/a/lPAmgBg
The way I see it I have a couple of options:
Option 1 is to do a bean animal style overflow, similar to this https://blog.marinedepot.com/wp-content/uploads/2017/08/bean-animal-2.jpg, but with some modifications to make it fit. First the primary drain (full syphon) will be a low profile strainer that is pretty much flush with the bottom of the overflow box. Then the secondary drain would be a very short tee with cap (doubt I could fit the 90) that fits under the bulkhead threading. The emergency would have to be in the middle since that is my only option. My main concern with this setup is if the secondary drain being so low will be a problem. Also, if I went this route should I just keep the 3/4" for the main or should I try increasing it to 1" right away?
Option 2 is to use a herby style overflow, similar to this https://blog.marinedepot.com/wp-content/uploads/2017/08/Herbie-1.jpg, but use both the left and right drains as the primary drains and then keep the middle as the emergency. Will that even work to have 2 primary drains both acting as full syphons for this type of setup? Again, should I keep both primary drains as 3/4" or try to upsize?
Thanks in advance for your help and any other suggestions are welcome!
