Brightwell Aquatics Xport PO4 Cubes - High-porosity Cube Filter Media for Phosphate & Silicate Removal from All Ponds & Freshwater & Marine Aquariums, 1000ML (XPCubeP1000)

I used as directed and it brought phospates down to zero practically overnight. I have now taken some cubes out as some phosphate is required. I would suggest that you start with a smaller amount than recommended and build up slowly until you get the results you are looking for.

Mixed reefman here with goniopora, torches, hammers, bubble anemones, elegance and digitata in a Red Sea 165XXL. Was constantly trying to keep phosphates under 0.15 with limited sustained success. I put 5 of these in 3 weeks ago, with no immediate, measurable difference.... even after 2 weeks. But suddenly, this 3rd week has seen an even reading of 0.06 after 4 long days of no other removal methods. What a surprise..... I just added 2 more, so I'll amend this next month ..... but for now I say get the small 250ml jar and try it for yourself. I have them in a discarded RO filter-cartridge holder. 1/4" RO tubing. About 1/2 a liter per minute passing through, if that. RECOMMENDED !!

We will see how much difference this will add to my previously established Saltwater Reef Aquarium! I will update my review every few months. I placed this Biological Media inside the top of my AIO Built in Sump. I recommend to always place Loose Biological Aquarium Media inside of a Reusable Netted Bag so you can rinse the Biological Media Bi-Monthly and Rinse away any detritus (Wasted Food - Dead Fish - Fish Poop.) If you Establish this Biological Media with Live Bacteria by first by 1. Soaking the Biological Media in a Bowl of Liquid for 24 hours before adding to your aquarium. 2. Add and Refresh your Aquariums Live Bacteria every week by adding the set amount on the bottle (Do Not Over Use or Using two Different kinds of Bacteria at the same time as you can end up Killing all your Livestock)(Also when measuring the amount of Live Bacteria make sure to subtract out the space of your Live Rock, [Example a 55 gallon tank filled with Live Rock in a Saltwater Aquarium you probally need to measure the Live Bacteria against about only 40 gallons of water, add back into your gallons the approximate gallons of water from your sump, so a 35 gallon sump typically will only be about 10 gallons of water, so you'll be measuring in this example 45 gallons of water)] and 3. Do Bi-Monthly Maintenance by Easily Removing your Biological Media you Placed inside a Netted Bag So you can Rinse Away all the Detritus so your Media Remains Healthy and able to do its job more effectively. The Media is very dusty in packaging, So I recommending rinsing the Biological Media before Soaking in Your Fresh Live Bacteria Bath then adding to your sump or chosen filtering system. ☆I sure hope people new to the Hobby will read this and Save themselves some Money by NOT OVERDOSING YOUR Aquarium with LIVE BACTERIA and also Doing a Bi-Monthly Rinse Maintenance you should have an extra Clean and Healthy Reef Aquarium!

Followed directly as stated on packaging and worked wonderfully. 10/10 recommend!

DOES NOT WORK. I, LIKE ANOTHER REVIEWER, USED ROWAPHOS TO LOWER PHOSPHATES, WHICH WORKED QUICKLY. WHEN PHOSPHATES WERE LOWERED WITH ROWAPHOS, I THEN ADDED XPPORT PO4 FOR LONGER USE BETWEEN CHANGES. DID NOT WORK AT ALL. PHOSPHATES CLIMBED IMMEDIATELY. COMPLETE WASTE OF MY MONEY.