Modern Reef Proportional Consumption Reef Keeping System

It contains all essential trace elements found in natural seawater, organic and inorganic micronutrients, and amino acids in one set of 4 canisters! All you need to maintain a thriving and colorful modern reef aquarium. A unique proportional consumption formula created and been used by Euro Corals to breed and produce spectacular corals. Modern Reef - Reef Keeping System is the base of our proportional consumption reef keeping system with Complete Reef Food and Polypop. Once you find your maintenance dosage and ideal KH level, our system will provide your reef with all it needs to thrive and color up by proportion of consumption of KH (carbonate hardness) and Ca (calcium).


  • Developed to enhance one of the most challenging pigments in reef keeping yellow and orange pigments
  • Enhance red, pink, blue, and purple pigments, especially the body and polyps of Acropora corals
  • Stimulate non-fluorescent chromoproteins for better pigmentation
  • Designed for blue side spectrum light reef aquariums for better fluorescent proteins or reflective pigments excitation and stimulation
  • The growth rate is highly improved when used with Complete Reef Food and can be boosted more with a correct white side spectrum light, but the RKS will be consumed more
  • 4 equal parts dosing system
  • No need to test for magnesium and calcium constantly, only KH
  • No need for any other 3rd product like amino acids, mixed trace elements, or any other tagged for coral coloration, polyp extensions, or growth (only Modern Reef - Complete Reef Food and Polypop)
  • Proportional consumption reef keeping system dosed by calculation to avoid overdose or unnecessary accumulations that may cause problems
  • Free of Nitrates (no3) or Phosphates (po4)
  • Will adapt to any aquarium setup and nutrient export method by finding the maintenance of KH and the ideal KH level that the reef aquarium should use with the calcium level
  • Improves water clarity by enhancing the propagation of sponges and sea squirts
  • SPS corals get longer colored tips


Blue version: 10ml x100 liters will raise 1dKH Black version 7.7x: 10ml x100 liters will raise 2dKH

Requairments and preparation

Moder Reef - RKS is ready to use a 4-equal parts liquid solution. It can be dosed by hand, but we recommend using a dosing pump. Especially for SPS dominant reef aquariums. Preferable a dosing pump that can be calibrated with 4 heads. If your doser has only 3 heads, you can combine one part of BASE KH1 with one part of BASE KH2 in one canister or container. In this case, you will have to multiply the combined BASE KH1 and BASE KH2 dosage by 2.
Please consider these tips below to improve the pump performance for accurate dosing and a stable reef aquarium:
  • The tubing from the canisters to the dosing pump heads should have the same length, and also, from the pumps to your aquarium should have the same length. This will make the pumps have the same conditions, and calibration will be more constant.
  • Calibrate your dosing pumps following the recommendation of the manufacturer. Don't forget to check the calibration every 6 months and recalibrate if needed.
  • Set the doser to dose equal parts and give at least 5-10 minutes between each dosing pump, avoiding dosing simultaneously. Ideally, start with BASE KH1, then BASE CAL, then BASE KH2, then BASE MAG, then again BASE KH1, and so on, with a 5-10 minutes gap.
  • Spread the daily dosage as many times as your dosing pump allows it per day. This is very useful and with great benefits. The Modern Reef RKS is formulated to supply trace elements, and some of them can be consumed quickly by reef aquariums. After a few hours will be taken to "undetectable" no matter the level. Even so, if ICPs can't detect these elements, our system will constantly provide them to make them always available for corals and avoid the "Greening Effect" by accumulation at the same time. Therefore, to make the most advantage of this unique proportional consumption formula, we recommend spreading the daily dosage per day as much as possible.

Dosage and recommendations

The basic parameters tested with great success by Euro Corals for keeping a thriving and colorful reef aquarium are the following:


390-440 mg/l


1280-1380 mg/l


7.2-8.5 dKH


>7 mg/l



To start with our method, make sure first to have calcium (Ca), Magnesium (Mg), and especially carbonate hardness (KH) within the recommended values stated above. You can use Modern Reef KH+, Ca+ or Mg+ if needed. Nitrates (No3) and phosphates (Po4) can vary if you prefer other levels, but we recommend following our suggested parameters while using Modern Reef - Proportional Consumption RKS method. First, find the maintenance dosage of KH (carbonate hardness) by dosing equal parts of each canister per day to keep KH between 7.2-8.5dKH. Then find your ideal KH level for your reef aquarium system and setup to complete the proportional consumption reef keeping system. Find the maintenance dosage of KH: Start by dosing 5 ml per 100 liters daily and adjust by 1-2 ml per 100 liters daily till you keep KH steady between 7.2-8.5 dKH. Remember to test KH daily and use an accurate KH test like Hanna Checker dKH. Find the ideal KH level for your reef aquarium setup: After finding the maintenance dosage of KH, try to find the ideal KH level for your reef aquarium setup based on the calcium consumption and level. In other words, please keep dosing equal parts to keep calcium stable between 380-440ppm and then test your KH to find your Ideal KH level keeping it between 7.2-8.5dKH. Once you find the ideal KH level for your tank, you don’t need to test calcium often. Scenarios:
  • If you are dosing equal parts from each to keep KH at 7.5 and your calcium is going down, raise your equal-parts dosage to increase and keep KH at 7.7 and recheck calcium after one week. Repeat if needed.
  • If you are dosing equal parts from each to keep KH at 8 and your calcium is going up, lower your equal-part dosage to decrease and keep KH at 7.8 and recheck calcium after one week. Repeat if needed.

Actions when starting with RKS

Ca ↓ KH ↓

Increase RKS equal-parts dosage

Ca ↓ KH ↔

Increase your ideal KH level and dose Ca+ if needed

Ca ↓ | KH ↑

Reduce your ideal KH level and dose Ca+ if needed


Continue with the same RKS dosage

Ca KH ↓

Continue with the same RKS dosage and dose KH+

Ca ↑  KH ↓ |

Reduce your ideal KH level and dose KH+ if needed

Ca ↑  KH ↑ 

Reduce RKS equal-parts dosage

The Reef Keeping System (RKS) requires Modern Reef Complete Reef Food and Polypop to complete the proportional consumption reef-keeping system. Please learn how to use them with RKS using the link below. If you have any questions about our Modern Reef products or services, please don't hesitate to contact us.