Another useful tips,

For some of us, we still uses hypo crystals to get rid of chlorine in new water. It will also cancel out certain amount chemical composition or medicine. Therefore, if we uses hypo crystal, no matter how accurate your dosage or medicine for fish's treatment added into the water, it'll be a waste. In other words, no matter how accurate your medicine's dosage added in, some how the hypo crystal will nutralise a certain amount or all of it. So, treatment will be very difficult due to inaccurate dosage.

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Japanese Ranchu is another ball game