6' x 3' x 2' Plywood Aquarium Build w/pictures

dallen2233

Candiru
MFK Member
Apr 12, 2015
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My original intent was to make a plywood aquarium 8' x 4' but I had to scale it back due to the limitations of the size of materials that I could haul in my car since the transmission blew on my truck. Any how, my original intent was to make a tank large enough to hold a shark. The limited size really constrained me to what kind of shark I could get so I made the build geared toward either a coral cat shark or a marbled cat shark.

The beginning phase I used 15/16" oak plywood. I had Lowes cut it to size so it would fit in my car. I used 2.5" deck screws every 2 inches along with a bead of wood glue on all the joints. Also at the same time I built the stand using 6 4x4s to hold the weight with 2x6s and 2x4s as the horizontal braces.
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In the next phase I used pond shield to water proof the inside. At this point I installed the front viewing glass which is 1/2" plate.
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Once I had waited for the two weeks for the silicone to dry, I sat it upright and began the leak test. I was luck enough to have zero leaks on my first attempt. I did use 270lbs of white fine grain sand, and no it wasn't live sand.

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I did build all of the electronics myself. So instead of buying led aquarium lights, I built them myself using 10 - 10W soft white leds and 4 - 10W RGB leds. I don't have pictures of the other stuff, but I can probably get it upon request.

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And now the Semi finished product. I just started to put trim on it last week so its not completely done. The tank inhabitants include: 1' marbled cat shark, brown powder tang, desjardini sailfin tang, a yellow tang, and a bunch of inverts.

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xraycer

Arapaima
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Sep 5, 2013
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Great job!

You made that look easy
 

thebiggerthebetter

Senior Curator
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Looks great! Can you tell us more on the waterproofing and the window sealing and installation, please?
 
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dallen2233

Candiru
MFK Member
Apr 12, 2015
135
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Texas
sure, The water proofing was done with pond shield. I bought it on amazon, 2 quarts for like $80. I did use all of the two quarts, but I applied a thicker amount than what Pond Armor said was needed. I used multiple thin coats until I used it all. I waited until each coat was dry until I scuffed it and applied another. Once the final coat was applied, I tipped the front onto the stand. I scuffed the areas where I knew the silicone would come into contact with the pond shield. I placed the glass pane in the whole and supported it in the center with a pair of 2x4s so that there was a 2" gap between the glass and the wood. I then put a health bead of silicone around the parameter of the glass opening (in that 2" gap). I then removed the piece of 2x4 holding up the bottom part of the glass and held the glass pane up while I applied silicone where the 2x4 had been. I then lowered the bottom of the pane and did the same for the top part of the pane. Next I applied silicone all around the outside of the glass pane so I had no gap between the pane and the sides, top support, and bottom of the tank. I also applied silicone to all joints of the tank just to be safe. Finally, I placed weights (dumbbells and books) on the glass while it dried to make sure I had a good seal. After two weeks, it was cured enough to be water tight.
 

pops

Alligator Gar
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Nov 24, 2013
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that's dang killer!!! great job!!!!
 

thebiggerthebetter

Senior Curator
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Dec 31, 2009
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Naples, FL, USA
Thank you. Did the Pond Shield directions say it would adhere to bare wood / plywood? Also, what's the Pond Shield is made of - I wonder how well silicone adheres to it?
 

dallen2233

Candiru
MFK Member
Apr 12, 2015
135
41
46
Texas
They did give directions on how to apply it to bare wood. It seems to be an elastic epoxy paint. I use the term elastic very loosely since it does have some give but no where near the same give as silicone. Silicone sticks really well to it, even if you don't scuff the surface you can't peel it up.
 
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