Individual treatment has several advantages in that any treatments can be better controlled and the fish more easily removed if it reacts badly. It is also cheaper in terms of chemical costs and it avoids the risk of upsetting the delicate eco-balance established in the pond and filter. The use of a short-term bath also enables higher, and therefore often more effective doses to be given. If fish are to be removed for longer-term treatment, e.g. where there are bacterial problems, then a suitable quarantine tank of adequate size is an essential requirement. Trying to treat fish in a small, badly designed tank is pointless, as any beneficial effects will be quickly negated by the stress caused by such poor environmental conditions.
Precautions When handling any chemicals, always wear gloves.
As already mentioned, some chemicals are poisonous and may irritate the skin. Mix the required amount in a bucket or similar, to ensure that it is fully dissolved. This is particularly important with tank treatments as uneven mixing could result in areas of high chemical concentration and therefore higher toxicity. Bear in mind that you are dealing with a sick fish that may not be able to stand up to the treatment or alternatively the diagnosis may be wrong and the treatment may exacerbate the problem. It is important that treated fish are watched immediately following treatment.