The Inevitable Upgrade: IM40 Long -> Fiji Cube 108

Mas0n

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From a 40B AIO, to a Fiji Cube 108 with sump! Excited to get this new tank wet. This has been a long and overdue project that stalled for a while due to life getting in the way!

Current FTS:
1785695869554.png


The OLD tank:

A990293B-4AB0-415E-8EE3-49527B3C94C7.jpeg


Goals with this new tank: more space, no more AIO with equipment hanging out of the back, and more room to automate testing!

Equipment that I’ll be using:

3x Gen 5 XR30s
2x MP40
Jebao 1000 gph return pump
Skimmer is TBD, any recs?
Neptune Apex
Neptune Trident
Versa for dosing AFR
Tunze Osmolator 3
Inkbird + 2x titanium heaters


Fish and Coral:
I currently have a chill pair of clowns, yellow coris wrasse, and a fire goby. I plan to add a flame hawk, PJ cardinal, and a foxface. Maybe a small tang at some point. I’m excited to finally house herbivores!

For coral, I have a nice mix right now of softies and LPS + some easy SPS. I’d like to get more Euphyllia.
 
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I initially did not intend to DIY the stand, but after ordering the tank and getting a stand that was not advertised and flimsy from Fiji Cube and some back and forth with support. I received a partial refund and designed and built my own instead.

I drew everything up in CAD and placed and order with TNUTZ for the aluminum extrusion and hardware.

1776561517278.png


I designed this thing to be stupid solid, I didn't want any racking, which the Fiji Cube stand was really bad for.

1776561589610.png

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After assembly, and a nice piece of 1/2inch PVC board on top!

I also drew up a quick design for a bottom board and had it cut from the same material. Love how it came out.
1776561720446.jpeg
 
I was also shocked to find out how expensive a lit would be for this tank! $4-500 from several sites. 😬

Went back to Fusion 360 and drew up a lid design and sent it off to be cut from a 1/2 inch piece of plexi glass.

This thing came out GREAT, the spline and net fit perfectly in the channel, with a great fit. And the plexi glass is rigid enough to resist warping, which is an issue I ran into initially when trying to DIY a lid with a window screen frame.

What I sent the shop:
1776562007672.jpeg

LidFinal3d.png


What I got back:

1776562142823.jpeg


Added 1/4inch net + .140inch spline, super happy with the results and much cheaper than I found online.

IMG_8026.jpeg


I left a 3 inch feeding port, that I will design and 3d print a little cover for soon. 😄
 
Mounting up equipment! 😎


20260427_215657_45F805AA-1BF1-4DA0-9199-5DC1DBEC0A23.png

Made this little jig for a hole saw, and the bushing thing to hide the cut and keeps cables safe.

20260427_215657_EE302D65-D47C-4377-B8FD-7E0A9661E020.png
 
I was also shocked to find out how expensive a lit would be for this tank! $4-500 from several sites. 😬

Went back to Fusion 360 and drew up a lid design and sent it off to be cut from a 1/2 inch piece of plexi glass.

This thing came out GREAT, the spline and net fit perfectly in the channel, with a great fit. And the plexi glass is rigid enough to resist warping, which is an issue I ran into initially when trying to DIY a lid with a window screen frame.

What I sent the shop:
1776562007672.jpeg

LidFinal3d.png


What I got back:

1776562142823.jpeg


Added 1/4inch net + .140inch spline, super happy with the results and much cheaper than I found online.

IMG_8026.jpeg


I left a 3 inch feeding port, that I will design and 3d print a little cover for soon. 😄
👍

Where did you get this done? How much was it?
 
👍

Where did you get this done? How much was it?
I used a local sign shop! They have tons of materials and can make complex cuts with their CNC router.

It was $220 for the cut 24x48 piece of 1/2 acrylic ($150 material, and $70 for cutting). Then another $15~ for the spline and net bringing the total to $235.

Not cheap, but much less expensive than other premade options.
 
The Marco rock I’ve been seeding is looking really good now!


20260429_133709_DCF959DE-BE2D-490D-981A-B984131FD3D9.png


Solid coralline growth 🤘
 
Excellent build!

I was mortified on the price of lids, and after having one on my 4 footer for months that annoyed me greatly I went lidless with the new 6 footer. So far no casualties.
 
Excellent build!

I was mortified on the price of lids, and after having one on my 4 footer for months that annoyed me greatly I went lidless with the new 6 footer. So far no casualties.
Thank you!

I’m jealous, I love the look of a tank with no lid. But I fear my fire fish would jump ASAP lol.
 
Designed and 3d printed this bracket that can attach to the aluminum with a drop in Tnut + bolt. Makes running the wires pretty easy and keeps them out of the way!
20260429_192759_0C59D4EC-04FB-4350-AE4F-1396E97F04E9.png


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20260429_192812_3B6C27C3-48FD-4DAE-828E-C1D2636EBEA8.png
 
Welp, it seems like one needs to tighten their unions for them to not leak. 🙃


20260429_230641_F065F5F2-E859-45B9-AE90-44691DDC9E45.png


Upside! The tank is filled, and water has reached the overflow! 😎😎
 
After tightening that union and checking all the others, we are groovy!!!
20260430_001009_B01AB461-A339-4B34-8E2E-A5AC79D27B06.png


20260430_001009_ECF73D92-5C8C-4DA9-97EC-774900E96B31.png
 
20260430_002633_3B32D035-981A-4F18-A402-DB32C9A76214.png

Custom lid fits perfectly! Love it! Printed some feeding guard holes as well.
 
20260430_134949_72DBD718-13FD-4145-B916-89384964C5DF.png

My supervisors watching me configure apex outlets.

My house is torn apart right now, the wife is ready for this tank to be setup 😂
 
Mostly operational!


20260430_154517_A9B34BBD-A261-4C15-A120-9E8C74A19A60.png


Just got the mp40s going, going to run them 100% to stir salt!
 
Sand in, and a quick little scape! Not sure this is final, but it works in a pinch!

IMG_8159.jpeg

IMG_8161.jpeg
 

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