The aquarium designed by my son as his hobby caused some problem, one is heater defect leading to mass death and another is leakage in water circuitry. Anyway, periodical inspection is indispensable especially in water circuitry. Joint in flange and couplers with O shape ring packing. Rubber parts and hose joint distor because of physical property, permanent distortion. Vinyl Chloride vinyl parts need precise maintenance because of material vulnerability, not a few parts are invited. The maintenance should be done by the designer, my son, but he had run far away for Snowboarding to Hokkaido. This is why I'm advocating him, we call this situation, "Oyabaka chanrin".
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