Fritz Aquatics Fritz Mardel – Coppersafe – 4oz
$10.39
Price: $10.39
(as of Nov 02, 2025 07:18:21 UTC – Details)
For infections of: Ich, flukes (Gyrodactylus), anchor worms, velvet/protozoan diseases and other external parasites. Ichthyophthirius (Ich) – white spot disease is caused by a parasite that attacks all freshwater and saltwater fish species. The fish appears to be covered by numerous white spots. The parasite is easily transmitted from one fish to another. Ich can only be controlled in the free-swimming stage of the parasite. Five to 30 days may be needed before the infestation is completely eradicated. Copper safe solution remains active for over one month in the aquarium. It is a safe, stable, non-staining concentrate that does not color aquarium water. Be sure to add copper safe solution to replacement water when water changes are made. This will maintain the therapeutic level of copper safe solution. Because copper safe solution is so stable in water, partial water changes are the quickest way to remove it from the water.
Is Discontinued By Manufacturer : No
Product Dimensions : 5 x 1.75 x 1.75 inches; 4 ounces
Manufacturer recommended age : 1 month and up
Item model number : 42020
Department : Unisex-Adult
Date First Available : November 15, 2014
Manufacturer : Fritz Aquatics
ASIN : B00OTH68Z6
Best Sellers Rank: #62,114 in Pet Supplies (See Top 100 in Pet Supplies) #576 in Aquarium Water Treatments
Customer Reviews: 4.4 4.4 out of 5 stars 413 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Treats 94 gallons
Not for use in reef aquariums
Live Nitrifying Bacteria eliminates Ammonia and Nitrates
Do not use Copper safe solution with fish species that have a known sensitivity to copper
Customers say
Customers find the water treatment effective, reporting it works flawlessly for whole tank treatment and helps save betta fish’s lives. The product is easy to use, doesn’t stain the tank, and receives positive feedback for its quality. However, some customers express concerns about fish health, with one noting it’s not reef safe. Additionally, durability receives mixed reviews, with one customer mentioning the 4 oz bottle doesn’t last very long.
Beth S –
Effective. Bad for rivers & ocean.
I have used this product for decades. I used to buy it in bulk. 80% of fish diseases are parasites of some kind. This pretty much kills them all. A little bit goes a long way.Unfortunately, copper’s effectiveness at killing invertebrates is not limited to your home aquarium. Wastewater treatment plants do not take out much copper, and everything you put down the drain (water changes) is released by the wastewater plant into rivers, streams, lakes, or the ocean. Copper sulfate disrupts the food chains of aquatic habitats by nuking all of the insects, mollusks, crustaceans, animal-plankton, worms, etc. It starves wild fish, amphibians, small reptiles, and shorebirds.Therefore, it is a last-resort medication. For fungus, use maroxy instead. For Ich, find a malachite green medication, or use “quick cure.”*I actually keep this product around for my houseplants: copper sulfate is a known fungicide, and it’s slightly antibiotic. I use it for root rot when natural remedies (Ginger, cinnamon, coffee grounds, granulated sulfur) fail. It is a last resort treatment for this too, and I never put it down the drain.*Quick Cure® is lethal to pet shrimp. Move sick fish to a hospital tank before treating for any parasites if you have shrimp in the tank.
J. Cromwell –
Finally, something works!!
I very rarely review products but this is an exceptional product. I had a group of swordtails and other fish that all came down with what appeared to be symptoms or ick or velvet (flashing, darting, shimmies, clamped fins, listlessness, etc.) but with no spots or dusting typical of those infections or heavy breathing indicative gill flukes, for example. My go-to treatment for ick and velvet is salt, which is usually effective; and these fish being very salt tolerant, I dosed a tablespoon per gallon, which I thought would have knocked out damn near anything. Well, despite a very temporary improvement, the symptoms persisted and the fish continued to suffer. Rather than trying a myriad of other treatments specific to only certain parasites, I decided on coppersafe – something that can knock down many different parasites. I pulled my snails out of the tank and dosed and the fish recovered within a few hours, fins up and moving and behaving normally. I don’t think I’ll know what these fish had but this product was highly effective at taking it out. I consider this a first line defense for anyone struggling to battle these symptoms, just make sure you remove any inverts as this stuff will kill them too!
Victor –
Works every time
Works great for those unknown bugs the fish come with
SP –
Saved my betta fishâs life from velvet disease!
If your betta fish has clamped fins AND looks like he has gold dust on him as if he is covered in pollen when you shine a flash light (not a phone flash light, but an actual flash light) on him, then you need CopperSafe. First, remove any carbon (carbon can also be present in replaceable filters, so cut them to get rid of the carbon balls that will absorb the mediation and make it ineffective) and perform a 50% water change with water that has been treated 24-48 hours ago (CopperSafe can become dangerous to your fish by binding with the chemicals in water treatments such as Prime and other dechlorinators and ammonia reducers, so itâs best to treat water 24-48 hours before adding it to your tank and adding CopperSafe). If you have a small tank and you arenât good at chemistry conversions or math, ask someone for help to get the proper dosage in your tank. Too little will be ineffective and too much will be dangerous. Buy a copper testing kit that measures âchelated copperâ for $7 at your pet store or online to make sure the copper is at a therapeutic level during the next 10 days. Donât change the water for 10 days, and keep a towel draped over your tank because the velvet parasite uses light to grow. If you must change the water, you will have to do very precise math to replace the CopperSafe that you took out with the amount of water that was removed. Feed your fish a couple of pellets once per day if heâs still eating (mine had stopped). My picture on the left is of my betta fish with velvet disease on the day I added CopperSafe, and the picture on the right is on day 10 when I was able to perform a water change. And the last picture is of my betta fish now, nearly 1.5 months later! Happy and healthy!
Elaine Kattawar –
You might need more
Used to treat a 75 gal aquarium for flukes. You have to re-treat the water when doing water changes, so the 4 oz bottle doesn’t last very long if you’re changing water like you should. I did notice less flukes after treating, but I don’t know if this lasts long enough in the water to cover the life cycle, as it does not kill the eggs.
maxcap11 –
Got rid of my snail infestation!
Somehow some tiny snails invaded my tank (75 gal), Ever morning I would see over 100 of them bunched up. This stuff worked and got rid of them in about 2-3 weeks. Saved me from having to empty the tank and starting over. Great stuff!
Amazon Customer –
Didnât help, didnât hurt, very expensive…
This did nothing to help my fish at all, it didnât slow or stop the parasites. Iâm giving a middle review because I donât think it hurt the fish and maybe I was just too late so I donât want to knock it too hard. But if you can tell your fish has velvet itâs already to late for this too help. The small bottle combined with the large amount needed for a normal tank (20 gallon) also makes it very very expensive.
amber key –
Works great!
Works great!