Colombo Phosphate Plus for Reef Aquariums

by | Aug 20, 2019 | Feeding | 0 comments

colombo phosphate plus Phosphate Plus is a new additive for reef aquariums, produced especially for advanced reefers, by Colombo.

The biggest problem for marine aquarium beginners is keeping a low level of phosphates and nitrates. The mantra is keep oligotrophic conditions in the tank to prevent algae from flourishing. As we become more experienced, we buy more high-performing devices as lights, pumps, protein skimmer, etc; doing so we can have an undetectable amount of phosphates. This is a potential problem.

Zooxanthellae, the symbiotic algae living on the external surface of the corals, have a mutual relationship of survival with the coral itself, and they need phosphates to live. It sometimes happens that, even if we have a bioavailable source of phosphates, usually due to a high number of fish, they are absorbed by the algae and so they are not detectable, even if present.

Zooxanthellae AcroporaZooxanthellae on AcroporaI

n this case we have to add a controlled source of phosphates. We are helped here by Colombo Phosphate Plus, a bioavailable and controlled source of phosphates. According to Colombo, the phosphate level to keep in a marine aquarium, without algae, is between 0.03 and 0.06 mg/l, and I agree with this, though I prefer to stay closer to 0.03 mg/l. Remember that those values must be kept without algae, or final results could be affected.

Colombo Phosphate Plus adds 0.01 mg/l for every 100 liters with a 0.1 ml dosing. This means that for a 300 liter tank with a non detectable phosphate level, to reach the value of 0.03 mg/l we should add 0.9 ml of this product. Colombo suggests dosing up to 0.1 ml of product in a day, and to constantly monitor the phosphate level in the tank with a good test kit, to prevent algae and cyanobacteria issues.

It is available in a 1 liter pack and it costs 20,65 euros ($23 USD).

What do you think about it?

[Translated by Agnese Poggi]

  • danireef

    Danilo Ronchi, aka DaniReef lives in Italy where he is hydraulic engineer, but starting from his love for reef aquarium and photography, he began to write about marine aquariums from 2006 and now he's published his first book "Marine Aquarium". From 2007 Danilo writes on his blog where publishes articles, pictures, product reviews, aquariums coverage, reportage and history of his tank. Now he's happy to be part of


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