Seachem ParaGuard 100ml/3.4oz
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.
Ingredients
- Glutaral
- Malachite Green
Specifications
| Item | Value |
|---|---|
| Volume | 100ml / 3.4oz |
| Quantity per Pack | 1 |
FAQ
Can ParaGuard be used in a filter system?
Yes, ParaGuard is fish and filter safe and can be used in tanks with active filtration systems.
Is ParaGuard effective against ich?
Yes, ParaGuard is effective against ich and other ectoparasites due to its aldehyde-based formula and synergistic blend.
Does ParaGuard affect water pH?
No, ParaGuard does not alter pH levels in the tank.

Jane Grant –
Used ParaGuard when introducing new fish to my tank. The treatment worked quickly and didn’t stress the fish. No pH changes observed. Good for new arrivals and helping prevent ich outbreaks.
Alexander Gill –
Effective against fin rot and external parasites. The fish stayed active during treatment. Only used once, but it was a reliable solution for a hospital tank.
Penelope Knox –
No formaldehyde or methanol — a big plus. Works well in a filter-equipped tank. Fish recovered fast and no side effects noted.