Phos-Feed - Tropic Marin
Buy now, pay later
Split your purchase into smaller payments with the provider you prefer. Pick your plan at checkout.
Checking out with Shop Pay? The Shop Pay screen only offers Shop Pay Installments. To pay with PayPal, Klarna, or Affirm, select Check out as guest to see every payment option, or use the PayPal button in your cart.
Shop Pay Installments
- 4 interest-free payments every 2 weeks on orders from $50 to $999.99
- 2 interest-free payments on orders from $35 to $50
- Monthly plans on orders from $150
- Check out with Shop Pay, then choose an installment plan
Payment options are offered by Affirm and are subject to an eligibility check and might not be available in all states. Monthly plans may include interest (0–36% APR). CA residents: Loans by Affirm Loan Services, LLC are made or arranged pursuant to a California Finance Lender license.
Learn more about Shop Pay InstallmentsPayPal Pay Later
- Pay in 4: 4 interest-free payments every 2 weeks on purchases from $30 to $1,500
- Pay Monthly: 3 to 24 monthly payments on purchases from $49 to $10,000
- Select PayPal in your cart or at checkout, then choose Pay Later
Pay in 4 is available to consumers upon approval and is not currently available to residents of MO. Pay Monthly is subject to consumer credit approval, with a fixed APR of 9.99–35.99%. The lender for Pay in 4 is PayPal, Inc. (NMLS #910457). The lender for Pay Monthly is WebBank.
Learn more about PayPal Pay Later
Klarna
- Pay in 4: 4 interest-free payments every 2 weeks on orders of $35 or more
- No interest or fees when you pay on time
- Choose Klarna as your payment method at checkout
Klarna Pay in 4 is subject to approval and isn't available in Hawaii, U.S. territories (excluding Puerto Rico), or for APO/FPO/DPO addresses. Late fees may apply.
Learn more about Klarna
Affirm
- Pay in 4: 4 interest-free payments every 2 weeks on eligible orders from $50
- Monthly plans with rates from 0–36% APR based on credit
- No late fees or hidden fees
- Choose Affirm as your payment method at checkout
Payment options through Affirm are provided by these lending partners: affirm.com/lenders. Your rate will be 0–36% APR based on credit and is subject to an eligibility check. Affirm Pay in 4 is 0% APR. Options depend on your purchase amount and may vary by merchant. A down payment may be required. CA residents: Loans by Affirm Loan Services, LLC are made or arranged pursuant to a California Financing Law license.
Learn more about AffirmUPC: 619106244746
Goes well with:
Target nutrients. Better growth. Brighter color.
Tropic Marin Phos-Feed delivers phosphate the way corals actually use it in a particulate form modeled after natural reef environments. Instead of raising phosphate in the water column, it provides a targeted nutrient source that corals can capture and utilize directly for skeletal growth and tissue development.
Phosphate is often limited in reef tanks, especially in low-nutrient systems, which can slow growth and dull coloration. Phos-Feed solves that by supplying bioavailable phosphate along with key trace elements like iodide, fluoride, and bromide—supporting stronger growth, improved structure, and more vibrant color.
Because it mimics natural particulate feeding, corals can absorb what they need without driving up overall nutrient levels, helping maintain balance while still fueling growth.
Key Benefits
- Targeted phosphate delivery for coral growth
- Supports skeletal development and tissue health
- Enhances coloration and overall vitality
- Includes essential trace elements
- Does not spike phosphate in the water column
Dosing Instructions
Mix with RO/DI water and add to a high-flow area of the tank. Best dosed near lights out when corals are actively feeding.
Start with 1 mL per 50 gallons daily. Adjust after 4 weeks based on phosphate levels. Do not exceed 4 mL per 50 gallons.