Once the aquarium is completed it must be thoroughly cleansed to make certain that no odd components of cement or foreign matter remain inside.
In an old tank that has previously been utilized for fish, but has not been utilized for a considerable time, a thorough wash inside with methylated spirits is generally sufficient to remove any dirt or organisms, but with a tank that has been newly made, additionally to the methylated wash, a strong solution of permanganate of potash should be swabbed into the corners and left for a week. The strength of the solution could be judged by colour. If the solution is nearly black, then it’s the correct strength.