Seachem ParaGuard
Description
ParaGuard is the only fish and filter safe aldehyde based (10% by weight) parasite control product available (for parasites on fish). 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.
Directions
Dosing
Remove all invertebrates from the tank as well as any chemical filtration. Use 5 mL
| Specification | Value |
|---|---|
| Active Ingredient | Aldehyde (10% by weight) |
| Contains Formaldehyde | No |
| Contains Methanol | No |
| Effectiveness | Targets ectoparasites, fungal, bacterial, and viral lesions |
| Safe For | Fish and filter systems |
FAQ
Can ParaGuard be used in a tank with live plants?
Yes, ParaGuard is safe for use in tanks with live plants as it does not alter pH or contain formaldehyde or methanol.
How long does it take to see results after using ParaGuard?
Results may vary depending on the parasite type, but visible improvement in fish health typically occurs within 24 to 72 hours.
Is ParaGuard safe for use in hospital tanks?
Yes, ParaGuard is particularly recommended for use in hospital tanks for new fish to prevent parasite introduction.


David Lee –
Used ParaGuard when my fish developed ich after a new arrival. The treatment worked quickly without harming the fish or the filter. No pH changes and no side effects. Highly effective and safe for both fish and tank systems.
Ian Knox –
Good product for new fish introductions. I used it in a hospital tank and saw improvement in fish within a few days. The instructions were clear and the dosage was easy to follow.
Pippa Kelly –
I’ve used several parasite treatments before, but ParaGuard stands out for being safe and effective. No formaldehyde means no risk to invertebrates or filter media. Works well on fin rot too.