windsor-aquatic
Fish Fanatic
The biggest single worry regarding second-hand tanks, as already mentioned, is the scratches which often go un-mentioned in the advertisement. Wherever possible I would try and view the tank or, if that is impractical, ask enough detailed questions to put your mind at ease. Statements such as "few minor scratches, easily removed" are not to be taken seriously; if a scratch can be felt with the nail it will NOT be possible to remove it, whatever you try. Also, when a tank has been in regular use and then left empty for any length of time, the silicone has a tendency to dry out and lose its elasticity. This frequently results in leaks when next filled, as the glass will tend to flex under water pressure and the silicone, which is designed to allow this to happen, is unable to do so. In 33 years of tank manufacturing I have regularly been asked to re-seal used tanks where this has occured.