Because ill fish pathogeny is major,be long-term conceal, bacterium of cause of disease of inside and outside having system and helminth kind make fish physical strength ebbs, the defensive capability of immune system drops, what just can make a ab extra is pressing can make bacterium and helminth breed in great quantities, a large number of the appearance that makes send ill fish is sticky exudation mucus, the protein in forming water is extra increase, so the body of ill fish expresses the breeding ground that is bacterium and helminth, also be the origin of the additional ammonia in water and carbon dioxide, after drug is being reached before drug accordingly, otherwise should change water, it is to rely on to face an experience, the judgement of observation and wisdom, be in what what this carries to be able to make reference only. Want nitrify system to run only commonly good, water is not muddy, it is OK to do not have effluvial flavour to need not change water direct drug, change water first conversely again drug. After drug if water is tertian,have muddy appearance, be forced to change water, need to use aeration 24 hours store the water inside water jar, and PH wants stability be in some is inferior and numeric store poisonous aggravate of the ammonia inside crock of the cure after water avoids to change water, this is have to movement. 　　

Because be the fish that fall ill is to be not borne,change water place to bring 2 degrees of stimulation with 牠 sticky body to be able to make an illness more exasperate again, the aquarium with a bit bigger precondition hangs the aquarium appropriate that treats a disease so again upside filter will use, rely on to change more as far as possible upside filters the water quality that cotton will come to maintain water system is not exasperate, the ability after illness waiting for a fish stabilizes OK and normal move about changes water.