Filter about porcelain tank fish culture 1.Aquatic plants are not suitable for coexistence with koi, because koi is a miscellaneous food, it will eat aquatic plants!2.In this case, it is really necessary to use an external filter (if it is a square cylinder, it is good to use a side-mounted filter) if it is a round cylinder, it is necessary to use an external type!3.Pump pump is not much needed!As long as the filter is installed, the supply of water circulation and air conditioning is generally enough!!!Koi is not suitable for straw tanks,It's better to be naked,Or only bottom sand.The external filter is fine,It's mainly sucking poop.No need to cheer,Because when the filter came out of the water,Will bring oxygen into the water together.And!Don't feed so often,It's hard for fish to starve to death,Once a day is enough,Don't feed too much,Can Dora poop,Make some bad gas appear in the water.Don't change water too often,Fish like old water,It is easy to get sick when changing water.
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The following separation methods are incorrect () A. remove sediment in salt water by filtration B. make tap water by distillation A. The sediment in the salt water is A refractory substance. the separation of the insoluble substance and the solution can be filtered, so A is correct;B. tap water contains volatile substances, which can be separated by distillation, so B is correct;C. iodine is easily soluble in organic solvent carbon monoxide and can be separated by extraction method, so C is correct;D. gasoline and vegetable oil are two mutually soluble substances. the separation of mutually soluble substances cannot be separated by liquid separation method, so D is wrong.D.