HELP MY TANK IS BOWING

[Hybridfish7]

30 long 36x12x16 just resealed held up with leak testing but now it's bowing
Silicone was dried for 2 weeks (just because I was busy and didn't get around to leak testing it)
What do I do
There are no fish in it
The egg crate is straight for reference, you can see how much it's bowing

 

[Hybridfish7]

Edit: false alarm the rim is exaggerated, the rim is just messed up but the actual tank is still bowing by a degree, so like 3/32 of an inch

 

[krichardson]

Does that top frame have a cross brace?

 

[BIG-G]

30 long 36x12x16 just resealed held up with leak testing but now it's bowing
Silicone was dried for 2 weeks (just because I was busy and didn't get around to leak testing it)
What do I do
There are no fish in it
The egg crate is straight for reference, you can see how much it's bowing

View attachment 1417629

I have a couple this size. That amount of bow is pretty much normal for this.
What are you looking at 1/8 inch maybe.
Mine do not have center bracing. Probably should from the manufacturer but doesn’t.

 

[krichardson]

I had an old 125 gallon that had no cross brace.I bought it used so no idea how old the thing was.It didn't bow but I changed out the top frame for one with center bracing anyhow.

 

[angelcrze]

I have 3 x 33g tanks with those dimensions. All three are bowed. Never causes any problems except my lid doesn't sit squarely.

They are not made anymore with those dimensions. The next tank I bought is a 40 gallon tall (same footprint but 20" high). This one has a center brace. For some reason, they didn't brace the 18" tall tanks and they all bow. It seems crazy a little strip of plastic protects against that....but I guess it does.

My 37g (2ft x 1ft footprint and 24" high) had a center brace, but not the 18" tanks.

 

[Rhykiru]

My 30G that's been set up for almost 2 years bows out to just about the same amount.. just under the width of the inner rim lip.