06-07-2011, 07:59 PM
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First, I would like to welcome you to Tropical Fish Keeping forum. Nice to have you with us.
I would not use Acurel F or similar water clarifying products. I tried to track down what is in it, but no luck. I suspect it is a flocculant [one reference I came across did so call it], like most "clarifiers," and these are very dangerous to fish in spite of what the manufacturers may say.
A flocculant is a chemical that binds particulate matter together; the idea is that the "cloudy" water is due to minuscule particles and these clarifiers bind them into larger particles that can then be removed by the filter media (pads, floss, etc). Problem is, the flocculants also bind together the gills of fish. At the very least this is extremely stressful to the fish that will have difficulty respirating, and this can weaken them and even kill them. Even if you have no fish in the tank, I would not risk it. When it comes time to add some fish, the lzast thing you want is additional stress from some chemical.
No water clarifier should ever be added to an aquarium. Find the source of the cloudiness and resolve that. In this case, it is simply a "new" tank and it will clear. I have one tank with an enriched substrate, Flourite, and I noticed it took several weeks to fully clear. This cloudiness is not harmful to fish or invertebrates.