My new 2600 gallon plywood tank project

BigDaddyK

Gambusia
MFK Member
Mar 9, 2011
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Yeah that's what pisses me off.. Nothing appears to be loose at all.

Pretty sure though now that the bondo is wet under the PA that is might be crumbling? If I remember right bondo doesn't do well in water.

Another huge design flaw perhaps.
Bondo was a huge worry for me when I built my 300. I used to work in autobody shop and we were extremely careful to ensure that the bondo saw limited amounts of moisture. That said at the direction of the manufacturer I used bondo on all the knot holes in my plywoord. So long as there is no compromise of material it would be fine. unfortunately there has been a compromise. I wish you well and for your sake and all of ours don't give up now. This WILL be an awesome tank when you are done. Keep at it!!
 

MaddMaxx

Jack Dempsey
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Jun 16, 2009
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I remember thinking on your first build that the cement board was way overkill, but maybe that was what prevented the flex/void issue. If you're going to add more plywood (with the possibility of more voids) why not just go back to cement board?
Hi VL,

As another possible option, what about doing a layer of the cement board with PA like you did on your 1500 build? That seemed to work out very well for you on that build; enough so that it convinced me to use a layer of cement board if I do another build or major repair overhaul on my 3000 gal. tank.
Any thoughts on the cement board?
 

VLDesign

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Mar 20, 2007
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Cement board is a possibility if I wanted to spend about $1500 on more pond armor.

The original 1500 is leaking again and it's from another spot. Not the same one where the ID sharks popped the cement board.

I hope to have that tank ready to take down in a few weeks and hopefully will see what failed there. This will help me determine if I am sticking with PA or not.
 

Mastiffman

Gambusia
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Nov 2, 2010
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Cement board is a possibility if I wanted to spend about $1500 on more pond armor.

The original 1500 is leaking again and it's from another spot. Not the same one where the ID sharks popped the cement board.

I hope to have that tank ready to take down in a few weeks and hopefully will see what failed there. This will help me determine if I am sticking with PA or not.

Dam man..... This has been one heck of chore at this Point... Almost could've scraped the whole bunch of PA off and started fresh with Epoxy and call it a day... Miht be a lst resort option though. Tkaing it down to the frame and find your "design flaws" and button it up. You've done to much work at this point. Have you considered that you may have needed more support between your beams of the floor? If that's indeed an area of leakage. Maybe the tear down tot he frame and adding joists in between the beams would be the extra design to end this crap for you. That and the Epoxy.

Anyway, cait wait to see the finished product.
 

VLDesign

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Mar 20, 2007
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Thanks.. I am sure it will work out. Just need to be smart about the next few moves.

Got my sample kit from Sanitred. I should know how well that will work out this weekend.

Liquid rubber isn't an option as I refuse to do business with a company that doesn't respond to email requests for more info.

Concrete backer boards installed on top of what is there is an option and being looked at.

A complete teardown of the walls and start over is also a last resort option I guess.

Main focus for now will be to get the fish moved to a temporary pond and begin the tear down of the 1500. Pond is going up this weekend and as soon as I can get the temp to match the 1500 I can begin moving fish.
 

Yanbbrox

Monster hole digger
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Oct 17, 2007
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VLD,

Not wanting to spend your cash for you but is going for a concrete block tank(ala JohnPTC) with PA a cheaper alternative if your going for a complete redo? If you go down this route. of course. Surely on a tank of this it has to be an option and it's been proven to work with concrete block, the block and rebar must be cheaper?
 

Yanbbrox

Monster hole digger
MFK Member
Oct 17, 2007
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Oh by complete redo I meant the plywood portion. :)

If I were to do again I would look into concrete a bit more that's for sure.
By the concrete option, I researched it heavily before deciding to go for glass, there is 0 info apart from John's tank on it. I'm going no where near you on the size but it's got to be a consideration.
 
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