• Made in USA
Not Eligible for Standard and Expedited Delivery.

API Stress Zyme Plus

Brand/Manufacturer: API
Item # Desc Pkg Price
56D 8 oz (Treats 480 Gallons) $0.34
56E 16 oz (Treats 960 Gallons) $0.55
056F 1 Gallon (Treats 7,560 Gallons) $2.01

API Stress Zyme Plus contains over 300 million live bacteria per teaspoonful to consume sludge and reduce aquarium maintenance, keeping the aquarium clean and improving the natural aquarium cycle. Making Stress Zyme part of the tank's regular upkeep routine assures an active biological filter, a cleaner aquarium, healthier fish, and good water quality.

Features of API Stress Zyme

  • Improves bio filter at startup
  • Keeps aquatic life alive and healthy
  • Help keep gravel and decorations clean and algae free
  • All natural
  • Contains live bacteria to consume sludge
  • Adds beneficial bacteria for a healthy aquarium
  • Made in the USA
  • Great for fresh or saltwater
  • Can be used with freshwater tropical fish, marine fish, invertebrates and coldwater species including koi and goldfish
  • Will not harm aquatic plants
  • Completely harmless to humans and pets
  • Breaks down harmful organic aquarium pollutants ammonia and nitrate

How to use Stress Zyme?

  1. Shake well before use.
  2. Add 1 tsp. per 10 gallons of water

What to buy with API Stress Zyme Bacterial Cleaner

FAQs of API Stress Zyme Plus

Can API Stress Zyme Bacterial Cleaner can be added while fish are in the tank?

Stress Zyme can be added while fish are in the tank.

How to care for the aquarium and fish with Stress Zyme?

  1. Feed and observe fish daily
  2. Test water quality and use Stress Zyme weekly
  3. Change 25% water every 2 weeks
  4. Keep a check on the acquarium temprature
  5. API Stress Zyme Plus User Manual

Customer Reviews


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What is HPFY’s return policy?

Customer satisfaction is our top priority. We stand behind our products. If the merchandise you received is defective or not what you expected it to be, and you wish to return the item, please submit a return request in the My Account section of our website, contact our Customer Service department at (866) 316-0162 / (203) 616-2850 or email us.

  1. Merchandise must be returned within 30 days of the receipt of your order. Returns are not accepted after 30 days.
  2. Items (including parts and accessories) must be returned in new, unused, and resalable condition in its original packaging.
  3. Before returning any product, the buyer must obtain a Return Authorization Number (RA#) from a customer service representative. With your RA# you will receive a prepaid return shipping label.
  4. Orders returned without obtaining an RA# will be entitled to receive only "In-Store Credit" that can be used towards future purchases.
  5. Return orders are subject to a 20% restocking fees.
  6. All custom orders and hygienic items are non-returnable. Refer to the “Non-Returnable Items” section for further details.
  7. Returns will be reviewed and inspected before issuing credit. Please allow 3 to 4 weeks for processing. The credit will be applied to your original method of payment.
  8. If the return is the result of a defective product or shipping error, we will refund the entire purchase amount and return shipping costs.

Which products are Non-Returnable?

Due to the hygienic nature of some items, they are non-returnable. The items listed below are non-returnable:

  1. All hygienic items.
  2. Opened personal care items.
  3. Anything opened, used, or tried on.
  4. All customized items.
  5. Besides these, items that have the “non-returnable” phrase on the website.

We reserve the right to make adjustments due to errors, changing market conditions, product discontinuation or typographical errors in advertisements. Images on the site may not always reflect the actual product. Footrests or leg-rests are not included with wheelchairs unless specified.

How do I receive a return authorization number?

You can submit a return request by logging into your account. You will receive the Return Authorization Number (RA#) details in the email within 2-3 business days.

  • Login to your account
  • Go to “order history”
  • Click on “return order”
  • Fill out the return form and Submit it

If you do not have an email address, we will make other accommodations for RA# Details. Write the RA# on your label affixed to your package prior to shipment.

How long does it take to receive a refund?

Please allow 3 to 4 weeks to process the returns. Once the item is received, and inspected, your refund will be processed and automatically applied to your credit card or original method of payment.

Is there any Restocking Fees?

  1. 20% restocking fees will be applied.
  2. Outbound shipping cost is non-refundable.
  3. For orders that qualified for free shipping, $8.99 will be deducted from the refund if the product is returned.

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