300+ gal w/ internal sump design

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Everyday Normal Guy

Feeder Fish
MFK Member
Mar 19, 2010
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Bellingham, WA
Looking for a little insight on the design I put together today, i'm not an engineer or a carpenter so i'm pretty much in the dark when it comes to this type of thing but i've read through most of the tank builds under 700g on here.


Most of the dimensions are in the pictures but the tank would be ~300g and the built in wet/dry sump should be ~50g minus ~12g of dry bio balls/scrubbies. None of the pictures show any type of supports since I was new to the program and it was frustrating me already :irked: and I was hoping to get away without any visible beams on the inside of the main tank or the outside of the whole thing although there will be a basic 2x2 (ripped 2x4) frame around the edges of tank on the inside for ease of mounting the plywood. All of the walls inside the sump are removable, the horizontal pieces would be supported like shelves and the two vertical pieces would slide down in runners. I'm thinking 1/4 inch acrylic for the sump pieces (unless I can use thinner or need thicker). Plywood would be at least 5/8 inch thick, maybe 3/4 since it will be the main support for the tank. Oh and i'll be using aluminum corner brackets on the outside of all corners for added peace of mind since i plan to skin the whole thing later on and they will be hidden.

I noticed there are a few measurements missing from the pictures and I apologize. There is 7 inches of plywood above and below the windows and 5 inches on the ends. There is also 5 inches around both access holes on top. The sump picture has no measurements shown because the chamber sizes are not finalized in my brain yet.

a few questions I have:

How much should I overlap the glass onto the plywood? In the design I have 2 inches top and bottom and 1 1/2 inches on the ends of the big window and 1 1/2 inches all around the small end window.

Since glass thickness calculators are based on an all glass aquarium are they accurate for plywood builds? If you ran 2x2 around the big viewing window to stiffen the plywood on the long side would that influence the thickness of glass needed?


I'm hoping to find a broken tank, 150g or 180g, that I can salvage the glass from so the glass dimensions in the plan are 72x25. I am assuming that these sizes would have 5/8 inch glass or better since my 90 has 1/2. If that doesn't work out i would have to buy a piece and change the design slightly to be more wallet friendly.


I've lost my train of thought so here are the pictures, any feedback good or bad is encouraged!




(disregard the 27 1/2" measurement, somehow i messed that up, its only 27")
l_a7157f49185e4afda92b511d22493cdf.jpg


(the border around the windows is the overlap)
l_6e26af319fb14a17830e1b5e3989478c.jpg


The filter sock area is slightly larger than the sock length, the drip plate is about 1" below the minimum water line, and the optional area (charcoal?) is probably way too big. The idea is to be able to get to any area without having to tear the whole thing down. I'm still undecided on using a power head at the pump exit in the wall or running pvc to a spray bar at the other end.
l_47b7db299fa44b0894f5a801671cb954.jpg
 
Oops still can't edit my posts.

Looking at the design i'm not sure anymore if the support from the top/bottom is enough to hold the front and back from bowing, may need to use 1 inch ply for those parts. Any imput from the engineers around here?
 
Just a couple suggestions.

Instead of the "teeth" skimmer I would put in bulkheads, and direct the water into the socks with pipes. You have a lot of wasted space in that filter. instead of carbon I would add bio media.
 
Yeah I know the filter area needs work I just had to get an idea down so I could visualize it. I'm more concerned about the tank stability though at this point. I'll whip up a new filter layout today and see what i can come up with, i didn't even think of using bulkheads before.

thanks for the feedback its greatly appreciated.
 
Just did a little reconfiguring of the sump area but i couldn't figure out how to make pvc pipe yet so its not included. 2" bulkhead feeding the 3 socks which are 3 inches below the water line (shown by the dotted line). Removed the charcoal area since it was a waste of space and increased the size of the pump chamber and the pot scrubber area. Drip plate and eggcrate in the same area as before i just didn't label it in this picture. Decided on running pvc or flex hose either along the front wall or under the substrate (if possible) down to a spray bar at the other end of the tank for better circulation and to keep it out of the field of view as much as possible. Same idea for mounting the dividers. Let me know what you think.

l_5ad8d2193e484adbaa7fb07519df8495.jpg


On another note I got a quote on glass today, and it seems I need to find a cheap or free tank to salvage the glass from unless 1/2" is sufficient but I don't want to take any chances. Any imput from the master craftsmen on here?

72 x 24 x 1/2 = $163.67
72 x 24 x 5/8 = $357.70

Also this is going to be the new home for my pacu which is ~18" long right now so it needs to be able to take a good hit from time to time.
 
According to garf.org you can use 1/2" glass on 36" high tanks, but you might wait for some more experienced glass builders to comment...
 
Remember, the glass will only be 30" deep. The depth below the bottom of the glass doesn't count.
 
I can't believe I didn't catch that before thanks for pointing that out. But to make sure I understand is it the depth of the bottom edge of the viewing window or the true end of the glass? If I use a 72x24 pane in 1/2 inch and shift the entire piece up 1 inch or so it should put the bottom edge of the viewing window at about 26" deep which seems fairly safe from what i've read.
 
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