In nature the population of zooxanthellae is controlled by the level of nutrients (nitrates and phosphates) present in the water. However, in a modern reef aquarium environment the control of zooxanthellae, through the reduction of nutrients (nitrates and phosphates), is the best way to get natural coloring of the corals. This has led to the creation of a multitude of "Management Methods" (Low Nutrients / Ultra Low nutrients).
Whether you are using microbiological methods or more traditional methodologies, it is necessary to keep consistent levels of nitrates and phosphates. ELOS AquaTest NO3-HR is specifically designed to assist you in tracking those levels.
The precise colorimetric scale with DUAL RANGE, allows you to read nitrate levels in a range between 0 and 4ppm with a minimum reading of only 0.15 ppm of nitrate. Used in conjunctions with the ELOS AquaTest Phosphate HR, assures you have the best system for full control of the level of nutrients.
ELOS America is the USA branch of a time-honored tradition. ELOS has been in business in Europe for over 25 years, and is recognized as one of the most innovative leaders in the aquarium industry. In 1997, ELOS was the first to discover that in closed systems, some species of corals (mainly SPS) significantly benefit (better colors and more rapid growth) from a reduced addition of organic additives (dissolved organic material), but only when compensated by a selective addition of high quality nourishment. Based on our groundbreaking and innovative research, ELOS introduced to the market a "Trio" of products to feed our corals – Omega (Amino Acids), SvC (planktonic Coral Food) and Pro-Skimmer (Carbonate Source).
ELOS was also the very first company to produce LED lights for the aquarium, the first to produce a rimless tank, the first to use probiotics in our foods, and numerous other firsts. ELOS is committed to providing high quality products to the aquarium industry and customers quickly recognize our dedication to not only advancing the hobby through research and innovation, but also our dedication to elegant simplicity in design and use. With the addition of a dedicated staff and warehouse in the USA, we are renewing our commitment to provide our customers with the best possible solutions and products available.
Most orders under $29 ship for only $2.99 using a mix of economy shipping methods including UPS Ground, USPS First Class, and/or SurePost. Your order will be delivered in up to 7 business days after it ships out.
We ship 99% of the products we carry for free within the contiguous United States using a mix of economy methods including USPS First Class Mail, SurePost and UPS Ground. Your order will arrive in up to 7 business days. Just spend $29 or more!
Over 90% of shoppers receive their orders within 1-2 business days. Upgrade from free economy shipping to faster shipping for only $2.99—or spend $250 and we'll upgrade you automatically!
Expedited shipping services are available for most products if you are in a hurry. Get guaranteed delivery in 2 business days, 1 business day, or next day by 10:30 am. Costs vary by location.
Same-day shipping is available Monday-Friday for most products—place your order by 10:30 am PST. Pre-ordered and back-ordered items do not qualify, nor do drop-shipped, live, or frozen shipments.
We ship live plants, live foods, and frozen foods within the contiguous United States. Each of these categories is subject to its own $19.99 flat-rate shipping fee to cover the special packaging and/or expedited shipping costs required to ensure safe delivery. Orders with 12+ live plants ship free!
Return any new and unused item within 60 days for a full refund. Having difficulty with a product? Contact us to speak with an aquarium expert. If you need a replacement, fill out this form.
A small segment of the 180+ brands we carry require that customers contact them directly if/when problems arise. You can view the full list of those brands and get their contact info here.
We are unable to accept returns of Digital Aquatics, Neptune Systems, Vertex Aquaristik, Aqua Illumination (AI), EcoTech Marine, GHL, or Seneye products once the manufacturer's packaging seals have been broken.
Marine Depot is an authorized reseller for every product we carry. That means when you buy aquarium supplies from us, your products are not only backed by our own 60-day return policy, they also carry full factory warranties, where applicable. Some items have a 1-year warranty, others have limited lifetime warranties. Warranty coverage varies from manufacturer to manufacturer, so please read the product description of the item(s) you are considering thoroughly for details or contact us if you have warranty questions.
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