---
product_id: 19620349
title: "OCTO OCT-MF300B 2.5 Inch Media Reactor"
brand: "reef"
price: "S$38"
currency: SGD
in_stock: true
reviews_count: 8
url: https://www.desertcart.sg/products/19620349-octo-oct-mf300b-2-5-inch-media-reactor
store_origin: SG
region: Singapore
---

# OCTO OCT-MF300B 2.5 Inch Media Reactor

**Brand:** reef
**Price:** S$38
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** OCTO OCT-MF300B 2.5 Inch Media Reactor by reef
- **How much does it cost?** S$38 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/19620349-octo-oct-mf300b-2-5-inch-media-reactor)

## Best For

- reef enthusiasts

## Why This Product

- Trusted reef brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

The Reef Octopus OCTO MF-300B Multi Media Reactor has everything needed for operation, except for the media. Comes with the feed pump, hoses and all fittings required for use. Capable of hanging over rims as large as 1". Features: Instruction Manual For aquariums up to 150 gallons (depending on the media used and the requirements for the media) Easy to set up and use Has double containment plates with sponges Great for use with granular activated carbon & GFO medias External or internal use in Sump Dimensions: 4″ x 4″; Body Diameter: 2.5″; Height: 15″ Includes: Feed Pump OTP300, 8 watts, Max Flow 95 gph Reactor Body All hoses & fittings required for use Does NOT include media. Great for use with granular activated carbon & GFO medias.

## Product Details

- **External Testing Certification:** NSF
- **Product Benefits:** Removes Impurities
- **Brand:** REEF
- **Unit Count:** 1 Count

## Images

![OCTO OCT-MF300B 2.5 Inch Media Reactor - Image 1](https://m.media-amazon.com/images/I/61rW-ghrqiL.jpg)

## Questions & Answers

**Q: Will this work for 90 Gallon Reef tank? or phosban 150 is better**
A: I bought it for my 75 gallon reef tank and it was under powered. It works well on my 40 gallon though. Id get the phosban you can get the most flow through. I have a 150 on my 75 and it works well. But inwish i had gone larger with a higher flow rate.

**Q: Does this come with an adjustable pump? Could I use purigen or gfo as my media?**
A: It does not come with an adjustable pump but you can use purigen or gfo. It works very wellFor me

**Q: Can I use this in the sump?**
A: Yes it fits in a small area. It works in or out of the sump

**Q: Only have 2 3/4" between my aquarium and wall. Will this unit fit?**
A: No it is to small to fit.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great!  Zero issues.
*by J***E on September 16, 2022*

I don't understand some of the negative reviews. I suspect people did not read the assembly instructions. You need to use the flexible tubing to make connections to the lid.Pump is quiet. No leaks. Perfect.

### ⭐⭐⭐⭐⭐ Customizable and it works for me and my custom sump setup
*by A***N on March 6, 2016*

I was hesitant based on all the reviews, but still bought and have no regrets. I have a Reef Octopus skimmer so I was going of the name and reputation of a great product. This unit is probably the same as the AQUATOP MR-20 (not Prime), but like I said, brand name based… **When I bought this was sold by Amazon (was Prime) it out of stock now from them**I have a phosphate problem in the local water supply (hard Midwest water) it was high (+5ppm) within 1 week of use with phosban media… it is now 0ppm in my 90 gallon and there is a noticeable change in the algae growth in my tank. Its more manageable by my cleaner crabs and snails.I did some mods to fit my sump setup, but it is used like the factory recommended setup is. I added hose Eheim ½ in (12/16mm) to the output so it empties into my sump return vs right next to the input pump in my skimmer chamber. If you hang on tank, it comes ready to rock as is.I also changed the stock pump (95GPH at 8watts) to a Cobalt aquatics MJ-900 (230GPH at 8.5 watts). The included pump is weak, but functional I just had a MJ900 laying around and thought why not! In the reaction chamber it looks like it has the same amount of “churn” movement on the media. As I did try the stock pump first. Some reviews said the stock pump broke… I have been using it in my curing bin for live rock for circulation for about a month plus… it’s still working no clicking or failure.Some Pros and Cons:Pros:+ It works (+5 ppm to Zero in < 1 week).+ Customizable. Pump, hose, foam and media can be changed for your setup if you so desire.+ Simple. Input, media reactor chamber, output.Cons:- Weak (but functional) pump. I just chose to change mine for more GPH benefit. But for a smaller tank it would do fine in it.- About $20 more than the like version. You are paying for the Reef Octopus printed logo on the reactor and the Reef Octo OTP300 pump.- Instructions are very vague and have little value, just pictures really. Made me laugh a little… Green hands! But in reality, this thing is simple enough to figure out with pictures if you have been in aquariums for any amount of time. Just be sure to have the foam pads touching the reactor media then the plastic guards so nothing gets through and the hose connections are tight.Again no regrets, it works and looks good next to my other reef octo skimmer. If you don’t want to pay for the prime benefit get the aquatop version (no easy returns via prime/amazon) so if you do return, it will almost cost the difference to ship to a third party seller.Hope it helps… any comments add them before you so say unhelpful. I will try to reply

### ⭐⭐⭐⭐ Small footprint
*by A***E on October 16, 2019*

Just hooked it up. Pump seems good right now. Directions suck. Octo ????? Nock off. Tiny. Fits great, slim design. Small footprint in sump area. Using kolar as media. Fired it up. Praying it reduces nitrates now. Last hope. Pump sucks after couple of weeks died.

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-02-04*