If you see your fishes are excreting white excreta, and the fish will also not eat then it must be that there had been a attack of Internal Parasites in your tank. In this case the fishes can be de-wormed by the following method.
Use Metronidazole B.P. Tablets - 200mg. (Buy for the entire 5 days tablet together so that you use the same brand of tablets for the entire course. A change of brand can cause a little change of the chemical composition causing problem with the fishes being treated.
Dosage: Use 1 (200 mg) tablet per 25 gallons water (94.6 Litres) (Dosage: 200mg per 25 US G, you will have to calculate the dosage according to the volume of water in your tank). Mix the tablets in a mug of water and stir thoroughly so that it makes a complete solution. Pour this water in the tank which is going to be treated. Never drop the tablets directly into the tank. Change water and repeat the treatment everyday for 5 days. Each day check whether the fishes still continue to have white excreta. If you still do not see black excreta after 5 days then continue the treatment for another 3 days.
When white excreta disappear and you see black feces from the fishes, then all the internal parasites have been killed and cleared.
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