First Defense was developed to help fish adapt to new environments by assisting the fishes natural immune system.
Changing the environment of a fish causes stress that robs fish of essential nutrients and can weaken their immune system. First Defense is scientifically designed to provide stress relief and support the immune system, helping fish cope with stress due to bagging and shipping from the store to your tank, water changes, new fish additions, disease treatments, and other environmental changes.
First Defense also contains buffers to help maintain the water pH. Further, First Defense detoxifies heavy metals and removes chlorine and chloramines.
I am a big fan of Dr. Tim's one and only. I bought this on a recomendation in hopes that it would relieve stress for newley added fish. I added 5 new fish to my established tank and used the first defense. Five days later 4 of the new fish died and then I had a Ich outbreak. I am not blaming the formula on the Ick and am sure the fish died due to the stress and the Ich. However, This solution did not seem to help any of my fish including the new ones that died. does it work/ I ahve no idea...saw no evidence of it.
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