Just got a used aquarium; How do I clean the gunk out?
NEVER EVER EVER use soap on an aquarium or anything used in the aquarium. Soap residue is very hard to completly remove and it is rediculousely toxic to fish. Windex is also a VERY BAD THING to use on a tank. Windex will weaken the silicone seals on a glass tank (making leaks more likely) and it will turn an acrylic tank yellow!! Bleach is fine because it rinses clean and evaporates very fast. Viniger is good for calcium and lime scale. Salt is good to mix with water to form an abrasive to help with the scrubbing. Good luck…
