400g Build Advice

[Anyparxia]

Hello, I'm planning on making a fish tank 240x90x70cm LxWxH. The glass thickness is 1/2". It's gonna be top and bottom euro braced the width is 4" and made of 1/2" glass along with 4 cross braces at 7" width also 1/2" glass. The drains are 3x 2-inch drains and will be a bean animal overflow. The returns are 1x 1 1/2" and 1x 1 1/4" which will allow at least 5x turnover rate. The weir combs are 4mm width and 1.5" height. Overflow box dimensions are 17x5x5" Rated for 6600 Gph based on my calculations. My questions are:
1. Is the height too tall for this thickness of the glass?
2. Is the weir and overflow box flow rate correct?
3. Is the plumbing good?
All advice and suggestions would be much appreciated!

 

[Cougarman]

My 400gallon is 30 inch tall and 6 feet long and my glass is 20mm thick. At that thickness I don't notice any bowing. 1/2 inch might be too thin for 28 inch (70cm) height. I think 3 x 2 inch drains is perfect and you have leeway to adjust the turnover if you want. Just my opinion. Sounds like it's going to be an awesome tank.

 

[Anyparxia]

I am still debating the thickness of the glass. I plan on getting the glass in a few weeks, any help would be great.

 

[Cougarman]

Error on the thicker side. Otherwise the glass can bow and eventually burst at the seams. The most pressure is at the bottom, middle of the long side.

 

[Anyparxia]

Going thicker would double the price of the glass and is not readily available in my area. The most pressure being at the bottom, middle of the long side I don't understand what you mean by that. Also thank you for helping me out

 

[Anyparxia]

Also if I did a double base with 12mm or a single 15mm base would it be better? I forgot to mention I plan on doing a floating base along with a top and bottom euro brace along with 4 6" crossbraces on top. The water level will be around roughly 26 inches. Ive read somewhere that if the end panels are more than 3'x2' it would not work is that true.

 

[Anyparxia]

So I went with what was advised and went 24 inches in height instead of 27. I went with a normal base where the panels sit on top of the bottom. I also used 2mm spacers to allow for a gap to silicone the bottom of each panel and will go along with top and bottom eurobrace along with crossbraces. I have some concerns about the build. I siliconed the tank on Jan 22 and after I was done as the silicone was skinning up I saw this in the bottom right corner of the seam. It occupies around 1/4th the seam that is 60cm high. All the other seams are flawless except this portion here. The four corners of the tank inside will be reinforced with vertical seam guards so I am not worried about it leaking. I am more worried about the structural capability of this seam. Should I be worried? Any advice is much appreciated.

 

[Cougarman]

I think you’ll be ok. I’ve had a couple tanks with little bubbles like that. It’s no biggie other than now that you’ve noticed it you’ll see it every time you look at the tank.

 

[Anyparxia]

Was stressing out whether to redo the seam or just go with it. Now my mind is at ease thanks! Yeah, visually it's no problem I wanted to cover the silicone job up with something. Do you know what tank makers use to do the black edging around tanks to conceal the water mark and silicone?