75G overflow sizing
- Thread starter mujimran
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I use a Modular Marine 1600 on my 70g and its perfect. I wouldnt want to go any smaller tbh. Also if your tank isnt setup already you should drill it instead of using an over the back style. Will create a lot less headache in the long run
It is 100% worth it! what tank did you crack?
i find it way easier to drill it vertically than horizontal. Mark it out, lay it on its side so the holes are facing the bottom so you dont have to drill sideways. Tape the back side where the glass is going to fall out. It helps with chipout.
just use the weight of the drill to drill through it. And have a slow stream of water from a hose go over the drilling area. With glass you aren't drilling you are sanding/grinding so you dont want pressure. It will be boring and take a long time.
drilling lets you get a bean animal setup so you can have a silent and safe overflow.
below is my 70g and the holes for my returns and modular marine 1600 overflow
WVNed
The fish are staring at me with hungry eyes.
2 drains so you can put a valve on one of them that lets you
Make it quiet
control the water level in the tank
have an emergency drain
mujimran
Active Member
That is a neat cut. Nice!It is 100% worth it! what tank did you crack?
i find it way easier to drill it vertically than horizontal. Mark it out, lay it on its side so the holes are facing the bottom so you dont have to drill sideways. Tape the back side where the glass is going to fall out. It helps with chipout.
just use the weight of the drill to drill through it. And have a slow stream of water from a hose go over the drilling area. With glass you aren't drilling you are sanding/grinding so you dont want pressure. It will be boring and take a long time.
drilling lets you get a bean animal setup so you can have a silent and safe overflow.
below is my 70g and the holes for my returns and modular marine 1600 overflow
I tried driling on the sode of my 50g tank last year and I know I exerted too much pressure to hasten it up. Didn’t want to take the risk then, thinking of doing it now.
So by the pic, you had it on thise 2 stands and the side being drilled was actually closer to the ground?
Will need few detailed instructions here please. (pic attached). I just had the background done. Outside is blue but Inside is black. So now I position it somewhat like you did, with the blue side facing the floor.
I have a Vivosun 800GPH pump that I plan to use in the sump. What should be the hole size? 1 inch or 3/4 inch?
And 2 holes right? I for drain and one for return on either side. Your pic seems to have 4 holes??
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WVNed
The fish are staring at me with hungry eyes.
The big hole in the center is for the overflow and the smaller ones are the returns that put water in the tank from the sump.
mujimran
Active Member
The big hole in the center is for the overflow and the smaller ones are the returns that put water in the tank from the sump.
I think 1 return pump is good for me. Want to keep it simple.
So drilling holes is pretty doable then.
How do you calculate the hole size and the pump power for continuous flow? or it doesn’t matter as their is no siphon break?
So most kits or overflows will come with everything you need. Im super happy with my modular marine overflow. It comes with the template and the drill bit. It makes it about as simple as can be.
find a kit that you want then go from there. I wanted a bean animal overflow since that gives you silence with the most safety. The modular marine 1600 works silently on my 75g and you get a large skimming area.
So by the pic, you had it on thise 2 stands and the side being drilled was actually closer to the ground?
if you are planning to go only 1 return i would do 1”. 3/4 will be a restriction.
so i drilled for 2 returns one on each side and then my overflow uses 2x 2”holes to get the flow it needs. Some have 1 some have more it just depends on which style you get. You can see that plastic peice near the cwnter holes is the template it came with which i just lined up and taped and it makes it fairly idiot proof. Just patience is key! I wanna say it took about 15-25 min a hole. Taping the bottom where it will come out also helps with chiping. A littlw bit is bormal you just want to avoid anything crazy
find a kit that you want then go from there. I wanted a bean animal overflow since that gives you silence with the most safety. The modular marine 1600 works silently on my 75g and you get a large skimming area.
So by the pic, you had it on thise 2 stands and the side being drilled was actually closer to the ground?
Correct i have my tank resting on 2 saw horses and then drilled down towards the ground. This way the weight of the drill is all you need and you cant have faling glass break your tank lol.
if you are planning to go only 1 return i would do 1”. 3/4 will be a restriction.
so i drilled for 2 returns one on each side and then my overflow uses 2x 2”holes to get the flow it needs. Some have 1 some have more it just depends on which style you get. You can see that plastic peice near the cwnter holes is the template it came with which i just lined up and taped and it makes it fairly idiot proof. Just patience is key! I wanna say it took about 15-25 min a hole. Taping the bottom where it will come out also helps with chiping. A littlw bit is bormal you just want to avoid anything crazy
