Sump Baffle Kit Waterbox Red Sea

(35 customer reviews)


“Once you raise the bar, you can never lower it.” – Me


Made from 100% high quality, 1/4″ cast acrylic, these baffle kits will give your sump separate skimmer and refugium areas.  The kits utilize my renown Octo Pods™, with the strongest neodymium magnets available, along with the very strict quality control standards I use to make the pods.  These are absolutely the most secure, toughest sump baffle kits available.  Fully designed and made by myself, these kits are also adjustable in case there are any dimension variations from the manufacturer.  The baffle kits will cut the open area approx. in half.  I have kits designed for popular Waterbox and Red Sea sumps, but I can also custom make them to fit just about any sump you have.  If you need different dimensions please inquire.

  • Optional clear viewing window is available.  Please be aware this window could allow light to spill into the back chamber.
  • Please make sure your sump matches one of the attached diagrams.  If you have another type of sump, contact me to have one custom made.
  • Waterbox sizes are measuring the inside-to-inside width of the center chamber.
  • External magnets (for both pieces) need about .625″ for clearance.


*Note:  These dividers are not guaranteed to raise the water level in your sump.  They are simply to divide a single chamber into two chambers.  Because flow rate in your sump may be different than someone else’s, your water level may not reach the top overflow teeth cut in your baffle.  THIS IS NORMAL!  The teeth are mainly used for backup, emergency purposes.


I use N52 neodymium magnets. Rare earth magnets are not reef safe on their own, so I fabricate custom acrylic pods that encapsulate the magnets and keep them away from your water. Please visit the magnet warning page for more information on these magnets.


My products are made to order, custom! Please allow up to 10 business days for fabrication time for most products. Because my products are made to order, fulfillment time can rarely take longer. Full custom orders can take up to four weeks to complete. Please let me know ahead of time if this may be an issue. Shipping prices listed are to the contiguous U.S. Please contact me if you live elsewhere and want a shipping quote. Because my products are handmade and/or hand assembled, there may be small irregularities (fingerprints, marring, hair, etc) which will not effect the performance of your product.

Plastics are fragile which can break and scratch easily. Always handle with care. Surface can be cleaned with a very diluted soapy water mixture and a soft microfiber cloth.

This product is warranted to be free of defects for the lifetime of the product. We will, at my discretion, repair or replace your product at no charge during this period (See the Warranty page for more info.)

Additional information


Waterbox, Red Sea


NA, 170 G1, 170 G2, 200xl, 250 G1, 350 G1, 425 G1, 450, 525 G1

Waterbox Width (See diagram)

NA, 7", 9-10.5”, 11-12.5", 12.5-14", 15"-16", 17.2"


No, Yes

35 reviews for Sump Baffle Kit Waterbox Red Sea

  1. Thinh To (verified owner)

    So happy with

  2. Brian (verified owner)

  3. Hannah B. (verified owner)

  4. Jonathan (verified owner)

  5. Douglas H. (verified owner)

    It works great and best choice I’ve made would highly recommend

  6. Andrew (verified owner)

    Great fitment !

  7. Michael M. (verified owner)

    Hands down the best craftsmanship I’ve seen.. fits and works perfectly in my sump.. don’t hesitate on getting one

  8. Jason W. (verified owner)

    I ordered a sump baffle kit for my Waterbox 70.2 aquarium. I had some questions prior to my order, which were professionally responded to in a timely manner. The product itself is impressive in fit and finish. Strength of the magnets is insane, and I’m definitely happy with my purchase.

  9. JOSEPH H. (verified owner)

    Quality and fitment are A+. I did have an issue since I have a E-170 and not a Reefer 170. Apparently the dimensions are slightly different but I reached out to Matt and he was able to make me new piece that fit perfect.

    I do wish I would have put in the few extra bucks for the window just for esthetic reasons but the all black does the job.
    Definitely a modification I recommend to anyone with a red sea sump.

  10. Christopher (verified owner)

    Reefer 350 sump baffle kit – the magnets are STRONG and show no sign of water leeching into them as other cheap magnets. I have already purchased other items from Octo Aquatics and they are holding up well.

  11. Tara J. (verified owner)

  12. Debbie (verified owner)

    Easy to install, does the job!

  13. Christopher C. (verified owner)

    Perfect! Strong magnets and created ample room for a refugium. Very sturdy and well built. If you are worried about this in any way…..don’t! It does exactly what it’s supposed to do.

  14. Abdullah A. (verified owner)

    Excellent service, no delays. Product arrived on time works perfectly. Thank you!

  15. Van (verified owner)

    This works perfectly, very nice quality too!

  16. Minh P. (verified owner)

    Great product and high quality, it came with no hardware but a quick email and a few days later it was already in my mailbox. I highly recommend it if you’re on the fence about it. My macro algae won’t be floating into my skimmer any longer. Thank you and I’ll be looking forward to your other products in the near future

  17. Peter Z. (verified owner)

    Very well made and easy to install. Does the job. Just make sure you know where you are placing it and that you can access the areas where the magents will be used.

  18. Lisa C. (verified owner)

  19. Melanie Simpson (verified owner)

    Beautifully made. Still waiting on my Waterbox and will review again!! Thanks Matt. Great customer service!!!

  20. Fredrick R. (verified owner)

    Great quality materials and workmanship. Perfect fit for my new tank sump. Just waiting on getting my refugium started. Couldn’t ask for a better product.

  21. Raymond W. (verified owner)

    Install was simple and fit perfectly.

  22. Lawrence (verified owner)

    Worked as expected. May need more slots for additional flow. Maybe not

  23. Amber Henderson (verified owner)

  24. Vincent P. (verified owner)

    Fits and works great for my wb marine x 90.3

  25. Massimo A. (verified owner)

    Excellent craftsmanship. Very sturdy. Prompt delivery and good pricing.

  26. Sean White (verified owner)

    I purchased this baffle for my Red Sea Reefer 350 and I couldn’t be any more pleased! It fits like a GLOVE, and the high strength magnets make it so easy to attach!

  27. Deane (verified owner)

    Exactly what I was hoping for and came way quicker than expected.

  28. Derek (verified owner)

    I got a sump baffle kit for my Red Sea Reefer 170 G2. The fitment is great and the magnets hold strong. Would recommend to a fellow reef head!!

  29. Nicholas (verified owner)

    I have to say I am definitely pleased with the product.

    The craftsmanship is outstanding, this is very well made, will definitely purchase other items and recommend to others as well.


  30. Lawrence B. (verified owner)

    It works great. I had some extra holes put in as I did not want to the water to raise up in the protein skimmer and it accomplishes that plus the sea lettuce can’t block the weir causing other issues. Perfect.

  31. Robert S. (verified owner)

    Great quality and excellent fit in Reefer 170. Just what I wanted.

  32. Lou P. (verified owner)

    Awesome design, well built, great customer service! Thank you!

  33. Daniel Mateja (verified owner)

    Everything was like explain. Very good with communication and answers any questions with a timely manner!

  34. Wade H. (verified owner)

    Very well made. Innovative design. Magnets are strong and hold strong. Very pleased i found this product as i can now transfer cheatomorpha from old aquarium to new one. Refugiums are vital and glad i was able to add one to my new waterbox sump.

  35. Adriano Rodriguez (verified owner)

    Great product. Easy to install… looks great.

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