Like the title says, I plan to repair the broken back pane of this 265 gallon tank. The tank was donated to Monster Fish Rescue a few months back, and we're just getting around to the repair now so I figured I'd start a thread about the repair as it's going to be a little off the wall. The tank was set up buy a window and vandals threw a brick or rock through the window breaking the tank... Here's some pictures:



Here's the back, there's actually a piece of glass missing!


The tank is also drilled towards the back on the bottom:


The tank is 84" from left to right, 30" from front to back and 24" from top to bottom. The eventual plan is to connect this tank to my 240 using a 6" section of clear PVC as a water bridge...


I'm starting a thread here to hopefully learn a few things from some of you other DIY people and I might be able to help a few along the way. I like to take pictures and shoot video so hopefully it'll be a fun thread

I plan to use Hardie Pannel/Drylok to repair the back pane of glass. I'm just gonna go right over it

Good luck, Def. a supporter of what you guys do. Keep up the good work

cool a fish "hampster" tunnel

"cool a fish "hampster" tunnel"

Nice! Never thought of it that way

Ok, I’ve got an Update:

As some of you may know I’ve started threads about this repair on a bunch of forums across the net. I decided to do this for a couple of reasons. The first is to possibly give people another way to repair tanks, large or small. The second reason is to hopefully meet a few more people that live in the fish world! On a lot of sites I’m known as “monsterfishrescue” or “TheFishGuy”. My real world name is Jonathan… Nice to meet you!
I’ve decided to make updates on all the sites the same to save me some time typing this up over and over again… Lazy, I know… LOL
Ok, I’ll get to the point. We got rained out this afternoon so I decided to take some time with this tank. I’ll take you all through what I did this afternoon step by step. Hopefully that’ll be the easiest and most clear way to get an idea of what’s involved and what exactly I did!

Ok, here’s the Drylok for those of you that don’t know what it is or what it looks like. This is the water based version of the product, it’s a basement water sealer that so far has proved to work great for aquarium projects:
http://i47.photobucket.com/albums/f197/jst...allon/001-1.jpg

This is the Hardie Panel, This IS NOT hardie backer board for behind ceramic tile. This is another product made by James Hardie to be used as soffits on houses sided with Hardie plank siding. It’s 5/16” thick and it’s a 4’x8’ sheet. It is concrete board and can be special ordered at any lumber yard, Lowes or Home Depot for about $30 a sheet:
http://i47.photobucket.com/albums/f197/jst...allon/002-1.jpg

1.) The first thing I did was measure how big the panel had to be. I measured the tanks back wall and took off ¼” for breathing room. Since the Drylok lays on quite thick you’ll need some extra room.

2.) Next I cut the Hardie panel to 23 3/8” x 82 ¼”
http://i47.photobucket.com/albums/f197/jst...allon/003-1.jpg

3.) Then I tried to put it in the tank laying flat but it didn’t fit, glitch number one in todays project. We’ve got a saying at work that goes something like this. “There are no problems, just opportunities” So now I had the opportunity to break some glass! Ye ha!
http://i47.photobucket.com/albums/f197/jst...0gallon/004.jpg

4.) It seems as if the top braces were made from tempered glass, which explodes when you break it or try to cut it! LOL I also had to drill out the rivets that held the aluminum braces in and pry it off. No big deal really…
http://i47.photobucket.com/albums/f197/jst...0gallon/005.jpg
http://i47.photobucket.com/albums/f197/jst...0gallon/006.jpg

5.) It’s a perfect fit! (measure twice cut 16 times LOL)


But not without some damage. As I was standing the Hardie panel up inside the tank my knuckle rubbed on the back pane of glass on the tank. The tank won LOL
http://i47.photobucket.com/albums/f197/jst...0gallon/009.jpg

Nothing a little piece of cloth and some electrical tape can’t handle LOL
http://i47.photobucket.com/albums/f197/jst...0gallon/010.jpg

6.) With the piece cut and ready to go I was able to get the first coat of drylok on it. I painted about a 4” swath on the back side around the edges and two stripes somewhere in the middle. Now that I think about it I’ll probably paint the entire back with the next three coats to ensure that the silicone will stick to the back .
I finished this first coat at 2:11 pm eastern standard time so the next coat will go on at 6:00 this evening. Then a third coat at 10:00. And if I can drag myself out of bed tomorrow morning I’ll get the fourth coat on.
http://i47.photobucket.com/albums/f197/jst...0gallon/011.jpg
http://i47.photobucket.com/albums/f197/jst...0gallon/012.jpg


Since I’ll need the roller again in a couple hours I loaded the roller with drylok and rolled it into a plastic grocery bag to keep it from drying.


7.) With the first coat on and drying it gave me an opportunity to clean the tanks back pane of glass and clear the edges or excess silicone. I also removed a few of the other loose pieces of glass from the back so they wouldn’t become an issue later. I did end up using a couple of razor blades to clean the entire back of the tank. When it comes time a week from now the entire back will be cleaned with glass cleaner and acetone to make sure the silicone sticks!
http://i47.photobucket.com/albums/f197/jst...0gallon/015.jpg
http://i47.photobucket.com/albums/f197/jst...0gallon/016.jpg

Total time invested so far:

1.5 hours
Total money involved: $142.00

Tank: $0.00
Two tubes of silicone and one gallon of Drylok: $30.00
Hardie panel: $0.00
Three tubes of silicone already in stock $12.00
Water bridge (clear pvc and 90* fittings) $100

Questions or comments are always welcome!

awesome! your doing a great job.

Camp out next time and if you see any vandals, kick their arses with a baseball bat!

good work,

i would have messed things up bad if i tried that! heh

Nah, you wouldn't have messed up, this is very easy...

And the vandals were not here, they were at the house where I got the tank from.... the next state over

Ok, I’ve got an Update:

The piece of hardie panel went in well, it fit good! I’m feeling rather confident about this one 


After cleaning the glass with acetone (which I feel is key to a great seal) I cut a bunch of prop sticks to hold the hardie in place.





After that I siliconed the edges with a heavy bead and I also went over every crack in the glass. Beyond that I made circles out of the silicone to hold the hardie in place. Making circles is a trick I learned from mirror installers. It creates a vacuum and you actually hear the silicone “fart” as it’s pushed into place LOL



After the prop sticks were put in place pushing the hardie tight I ran a nice bead of silicone around the inside corners then smoothed it out with the back side of a spoon. That pushes any unwanted bubbles out of the silicone making for a tight seal.





Tomorrow when I get home from work I’ll have the task of moving the tank next to my driveway to fill it with some green nasty pool water to see if it holds. Others will say 24 hours isn’t enough…. I disagree  (plus I’m impatient LOL)

Wish me luck!

Here’s more pics!

http://i47.photobucket.com/albums/f197/jst...allon/006-1.jpg

http://i47.photobucket.com/albums/f197/jst...0gallon/008.jpg

http://i47.photobucket.com/albums/f197/jst...allon/009-1.jpg

Well the tank was filled thursday nite and I had a heck of a time getting the bulkheads to no longer leak LOL But all in all it's a success! The tank is still holding water now!

No issues, no problems! Now to get to work on the entertainment center where it's going to be sitting

Thanks for the tip about the circles of silicone, that's a really great idea! I have a few places that I could put that to use. I've seen acrylic backdrops held in place with big blobs of silicone, but they usually popped off in less than a month. Best of luck .

Silicone and acrylic usually don't mix well to begin with! Although, I did split a 55 in two by sliconing the snot out of a piece and it held until it was taken out of service a little over two years later....

I think we can say the repair was a success, so the tank is a on a trailer in the shop waiting for me to build a stand...

Thats a cool project. The tunnel is very cool to and what are you gonna put in those tanks?

Thanks Large SA/CA cichlids

Nice work!

Thanks!

your a bad@ss!!!! awsome job!!!!!!

Thank you Well, as I like to tell everyone when they're looking to get a fish and then a bigger tank later... Life's what happens when you're making other plans... I've since sold this tank and will be taking on a different project....