Fiji Cube

All-in-One Drop-In Kit for 40 Gallon Breeder Aquariums - 4th Gen

In stock
Out of stock

- +

The Fiji Cube AIO Drop-In Kits simplify the process of building an all-in-one aquarium with a pre-built sump box that fits perfectly in the back of your aquarium and includes divided sections for your filtration, heating, and water circulation equipment. Fiji Cube designed this AIO box to maximize the filtration potential and minimize the effort, time and cost to DIY an All-in-One aquarium. Get to the fun parts of creating your aquascape and enjoying your aquarium. Just drop this AIO box into a standard aquarium that is readily available in the market and your all-in-one aquarium will be ready to roll. 


This AIO kit is a quick and great solution to set up a tank where simplicity and space savings are a concern. It is suitable to be used as a quick DIY solution for a display, hospital, frag growth tank, and much more. This kit will fit most appropriately sized aquariums with standard dimensions.


*Please note that this 4th Generation model does NOT include the magnets featured in the product video and will need to be glued in.



  • Silicone ready
  • Space-saving design; no external plumbing required
  • Filter sock included
  • Quality cast acrylic



  • AIO Outer Dimensions: 16.20”L x 4.76”W x 15.5”H
  • Media Basket Chamber: 4.4”L x 3.4”W
  • Skimmer Chamber: 4.4”L x 6.7”
  • Return Chamber: 4.4”L x 4.43”W
  • Pump Connection: 5/8" hose
  • Flow Rate: 320 GPH


What’s Included?

  • Fiji Cube All-in-One Box
  • Filter Sock Holder with Filter Sock
  • Plumbing Kit with Adjustable Nozzle

Note: Return pump and aquarium not included and are for illustrative purposes only.

More Information
UPC 761856629493
Write Your Own Review
You're reviewing:All-in-One Drop-In Kit for 40 Gallon Breeder Aquariums - 4th Gen
Your Rating
Only registered users can write reviews. Please or

Product Questions

#1. You picture the unit tucked into the short side of the tank. Am I correct it could also be placed anywhere on the long side?
#2 You mention magnets to hold in position. Is it also okay to silicone into desired position?
Question by: Ralph Kraayeveld on Aug 7, 2022, 9:17 PM
Hey there,
Thank you for reaching out to us. Yes, it can be placed anywhere in the tank. Yes, you can silicone it in. I have done that on the 10-gallon one we have set up.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Aug 9, 2022, 8:50 AM
Where can I order more socks for this drop in AIO? Thanks!
Question by: Luis on May 22, 2022, 7:37 PM
Hey there,
Thank you for reaching out to us. You can purchase more socks from Bulkreefsupply.com

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on May 23, 2022, 8:59 AM
Can you use this for freshwater or just salt water?
Question by: Jason on Apr 17, 2022, 9:50 PM
Hey there,
Thank you for reaching out to us. You can use this for freshwater too.
Answer by: Matt Lucero (BRS Staff) on Apr 21, 2022, 9:15 AM
What exact brand of 40 Breeder is this supposed to fit I have three different 40 breeders and they are all 17 1/2 inches on the inside This drop in says it measures according to your website 16.20 inches that’s going to leave roughly 1-1/4” of gap on the side of the drop and insert
Question by: Marc on Feb 28, 2022, 4:12 PM
This kit will fit Marineland, Tetra, and Aqueon standard aquarium tank.
Answer by: Matt Lucero (BRS Staff) on Mar 3, 2022, 8:27 AM
Would 2 of these 40g AIOs work for a 75g tank ?
Question by: Steve on Feb 19, 2022, 12:15 AM
These are intended to be used solo and are designed to fit the specific tank listed in the product title. You could potentially use multiple in the same system if desired.
Answer by: Ashley Hoglund (BRS Staff) on Mar 3, 2022, 3:13 PM
Hi I have a question about it! Which return pump can I use on a all in one Fiji kit?
Question by: Alexis on Jan 12, 2022, 11:37 AM
Hey there,
Thank you for reaching out to us. A retunr pump smaller than 4.4”L x 4.43”W will fit.
Answer by: Matt Lucero (BRS Staff) on Mar 24, 2022, 10:08 AM
Are you intended to place your own protein skimmer inside the filter and if so what is the maximum size that would fit
Question by: Alex Luzier on Dec 8, 2021, 11:45 AM
Thank you for your question. You can install a skimmer into the Fiji Cube All-in-One kit but it is not necessary. The skimmer section is 4.4”L x 6.7” so you could install a skimmer such as the AquaMaxx WS-1:
A skimmer helps remove nutrients from the system, but you can also handle nutrient export via regular water changes.
Answer by: William Glenn (BRS Staff) on Dec 15, 2021, 11:23 AM
Is it a protein skimmer made for the AIO drop in filter
Question by: Calvin Coleman on Dec 2, 2021, 6:30 AM
You can choose from a number of nano skimmer options for the 40 Breeder drop in kit. I would recommend checking out the WS-1 by Aquamax. It would be a great option:
Answer by: William Glenn (BRS Staff) on Dec 14, 2021, 9:53 AM