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Seachem Paraguard 500ml Freshwater & Marine Parasite Control

Quick Overview

ParaGuard is the only fish and filter safe aldehyde based (10% by weight) parasite control produc...

Availability:Out of stock

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ParaGuard is the only fish and filter safe aldehyde based (10% by weight) parasite control product available.

Suitable for Freshwater and Marine Aquariums

Unlike highly toxic and difficult to use formalin based medications,

ParaGuard™ contains no formaldehyde or methanol and will not alter pH.

ParaGuard™ employs a proprietary, synergistic blend of aldehydes, malachite green, and fish protective polymers that effectively and efficiently eradicates many ectoparasites (e.g. ich, etc.) and external fungal/bacterial/viral lesions (e.g., fin rot).

It is particularly useful in hospital and receiving tanks for new fish and whenever new fish are introduced to a community tank.


  • In the aquarium, use 5 mL (1 capful) to every 40 L (10 gallons*).
  • Repeat daily as required as long as fish show no stress.
  • For 1 hour dips, use 3 mL per 4 L (1 gallon*).
  • Dips may be extended if fish show no evidence of stress.

Not for use in aquariums containing invertebrates. 

Not suitable for tanks with reef/corals.

Additional Information

MPN 20726
Barcode 000116060301
Brand Seachem

Customer Reviews

4 Item(s)

per page
Brilliant product Review by Veronika
Saves a lot of little lives. (Posted on 21/11/2016)
Great product and service Review by Ash
One of my gobies (marine) was showing signs of an illness. It was possibly marine "ich" but it was unclear what it actually was as the presentation didn't really fit. Either way I knew I needed to put all of my fish in a hospital tank to treat them; it may be freshwater filter safe, but live rock/sand is likely to mess up the dosage if nothing else. I also have inverts I do not want to jeopardise.

Not long after I dosed my hospital tank the green goby's symptoms dissipated and then disappeared. I have used ParaGuard every day for two weeks at the full dosage. I am now going to observe and quarantine the fish for a further 6 weeks in addition to leaving my display tank fishless. Hopefully no more illness *crosses fingers*

Whatever it was, ParaGuard does appear to work, along with a dose of care and due diligence. It is a shame more fish stores do not carry this as the traditional copper treatment is not necessarily the answer - and can be a hindrance - when the problem is not clear.

Great value from Warehouse Aquatics, too. Also sent the next working day.
(Posted on 16/11/2016)
Excellent service. Review by Howard Lloyd
Used before. ...great product. (Posted on 08/06/2015)
this is gentle to stock but kills the parasites Review by brett
this seems better than most at treating fish that can be hurt with copper based medications
as with most Seachem products it is very good quality
I have not lost a single fish while using this and my Synodontis cats tolerate it very well at the stated use dose (Posted on 17/07/2013)

4 Item(s)

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Postage Information

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Orders over £30 are Delivered FREE!

Providing none of the items in your order require pallet delivery or are excluded from delivery promotions, we will give you free standard delivery. You can still upgrade this service if you wish, and will only pay the difference.


Pallet Deliveries are different.

For items that have to be sent by insured pallet or other special delivery, these are excluded from the standard delivery offer and instead follow a different system. Pallet deliveries are split into 2 tiers: tier 1 and tier 2. Pallet deliveries take 2-4 working days and cannot be tracked.


For pallet deliveries we will contact you to confirm the delivery address and delivery day before releasing the order.


Please note that the pallet delivery service is a drop at kerb only service, the drivers are not insured to handle goods into homes and you are required to dispose of the pallet.


Pallet Tier 1

This tier is for solo tanks and cabinets, or other solo high weight products that we can't send by a normal courier. We subsidies the majority of the true delivery cost for these items to offer the best value we can. The shipping cost for these is calculated at checkout.


Pallet Tier 2

New for 2020! We are proud to announce we now offer FREE mainland UK pallet deliveries for Pallet Tier 2. Pallet Tier 2 is for the larger full tank and cabinet sets, such as the beautiful Juwel Rio, Lido, Trigon and Vision ranges.

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