$26.99 CAD

Phyto Size
Bottle Size
1 in stock

PhytoGold - Liquid Gold Phytoplankton Food

  • Provides phytoplankton ranging in size from 4 - 20µm.
  • Ideally sized for many soft corals, clams, sponges, tunicates, tube worms, and larval invertebrates.
  • Formulated to provide over 75-million phytoplankton cells per ml.
  • Does not require refrigeration.
  • Supplemented with a proprietary amino acid to aid in the colouration of invertebrates.
  PhytoGold - S PhytoGold - M
Phyto Species Isochrysis sp.
Pavlova sp.
Thalassiosira sp.
Phyto Size 4-10 μm 8-20 μm
Used for feeding Soft Corals
Tube Worms
Soft Corals
Tube Worms


Dosing Instructions

Shake product well before using. Turn protein skimmer and other forms of mechanical filtration off prior to adding food suspensions to aquaria, and allow 10 - 15 minutes after feeding before resuming operation of filtration.

Target Feeding (recommended): Target feeding may be carried out with a lengthy piece of rigid air tubing, plastic syringe, pipette, dropper, or similar device; pour 5 ml (1 capful) into a small container and suck a portion of this into the feeding device, then slowly discharge the contents of the device 2 - 4” upstream of the target organism(s). Repeat these steps as deemed necessary. Rinse the portion (inside and outside) of the feeder that was placed into aquarium water before placing it into this bottle (if feeding directly from the bottle rather than from a separate container); failure to do so will contaminate the product and encourage it to decompose.

Broadcast Feeding: Add up to 5 ml per 50 gallons of water in the entire aquarium system in an area of rapid water movement daily for the first four weeks of use; thereafter, the dosage may be increased as desired.

Notes: Add no more than 5 ml total of liquid food suspensions per 50 gallons of water in the entire aquarium system daily for the first four weeks of use; thereafter, the dosage may be gradually increased as desired. Starting out at a low dosage and gradually increasing it with time will allow the biological filtration in the aquarium to adjust to the increase in nutrients and prevent water quality from deteriorating.

Planktonic food suspensions (such as this one) are best utilized by target feeding specific invertebrates in an aquarium; in doing so, the majority of the food may be consumed by the intended organisms rather than ending up in filtration media or indirectly impacting water quality (as often occurs when indiscriminately “broadcast feeding” by adding liquid food suspensions to a stream of water and allowing the contents to disperse randomly throughout the aquarium system).


Food Rotation: Foods for corals should be rotated to provide variety and a more complete nutritional profile.  Brightwell recommends that you don't just mix all your foods together and feed the same thing every day.  Feeding a broad range of nutrients will more closely simulate what animals encounter in their natural habitat.  Do some research on your animals to see what their nutritional needs are.  Brightwell makes a number of different planktonic and particulate foods that can be rotated to provide a more balanced diet.  These can be fed in addition to the CoralAminōand Restōr which can be fed every day along with those foods.  Some of them are PhytōGreen, Zooplanktōs, and Reef Snow.

Technical Background

Brightwell Aquatics PhytōGold is a concentrated suspension of Isochrysis sp. and Pavlova sp. for S, and Thalassiosira sp. for M. These unicellular marine algae ranging in size from 4 - 20µm and providing the three omega-3 fatty acids EPA, DHA, and ARA; both species of phytoplankton are particularly rich in the omega-3 fatty acid DHA, as well as in several important amino acids. These algae fall within the size class of plankton known as nanoplankton (2.0 - 20.0µm), which is sometimes considered microplankton. They are the proper size for feeding many species of soft corals (particularly those with short tentacles), as well as clams and other bivalves, sponges, tunicates (sea squirts), plumed worms (Christmas tree worms, feather dusters, etc.), and larval invertebrates such as those of many bivalves.

Though Isochrysis, Pavlova, and Thalassiosira provide a number of amino acids, one that is not naturally present has been added to PhytōGold; this proprietary amino acid has been shown in studies to increase the colouration of corals and other marine invertebrates. Additionally, a small percentage of vitamin C is present to increase the benefits of PhytōGold, particularly to corals and their allies that have recently undergone fragmenting or propagation.
PhytōGold may be used in conjunction with other planktonic suspensions to provide a complete range of sizes to filter-feeding and planktivorous organisms.

PhytōGold does not require refrigeration, however, storage in a cool, shaded area will prolong the activity of the vitamins. Refrigeration will maximize the shelf-life of the product.