4' 90 Gallon converted to 240 4' Square Plywood and Glass Build

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nolapete

nolapete

Jack Dempsey
MFK Member
Jun 1, 2007
2,726
9
38
New Orleans, LA
I was helping Greengiant with his build and got to thinking about my 4' 90 gallon I have in the garage that has a busted side. I have to strip the tank to replace the side, so got an idea to expand the tank to a 4' square 240.

The tank will take a little more than 1 4x8 sheet of 3/4" plywood and about 6 or 7 2x4s and 6 or 7 2x6s. I have some of all left over from the 4300 build. Probably just need to buy plywood. I think I have a way to use the unbroken side glass in the build as well for another window.

If this works, it will make it easy for us to expand our existing tanks for next to nothing since we already have the glass.
 
Too bad it isn't the bottom that's broken. You could have two 4 foot windows.
 
i dont think the glass would be thick enough to hold the pressure
 
xdragonxb0i;3746117; said:
i dont think the glass would be thick enough to hold the pressure
Click to expand...

You need to check out this site then http://scubageek.com/articles/wwwparad.html

There's no more pressure than there is in the 90.

FSM, it's the side that is busted, not the front or back. It will have two 4' windows and an 18" window. I'm going to build it where I can add another 18" window if I choose to buy another piece of glass.
 
If you make the bottom plywood this would give you another near 4' piece just a bit narrow though.
 
Bderick67;3746271; said:
If you make the bottom plywood this would give you another near 4' piece just a bit narrow though.
Click to expand...

Yeah, I thought about that, but I want to try to limit materials by not going wider than 4', so that I can use one sheet or slightly more. I'd have to go wider than 4' to use the bottom glass.

I have another 4' 90, so if this works I will be able to use the bottom glass from both of them to make another shallow tank of the same design.
 
Here's the design for the 30 to 60 conversion test tank. The 30 gallon is 24" show. The design converts it to a 60 gallon with built in sump. I'm thinking about using a built in UGF and running it reverse. Eggcrate across the sump with batting to catch all particulate matter and it should be crystal clear.

The tank part of the design is based off of the 90 to 240 conversion. Since one of the small pieces of glass on the 90 is broken, I may center the small piece instead of having two. I could put one offset and allow for installing another piece if I chose to buy it later.

tank conversion design.jpg
 
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