"Desmond Wong" wrote in message
...
Hi,

Any ideas on the best way to clean a second hand tank? I have aquired one,
and found that because the previous owner kept it only half full, the
bottom
half of the tank is quite clean, but the top half has this white film-like
substance on it.

I have tried using water and a razor blade, doesn't seem to lift. What
would
be safe to use on it to rid this stuff?

Des.



I clean all my used tanks with bleach. For a 75 g, I add one cup of bleach
and fill the tank. I run a airstone in the tank overnight and drain and wipe
clean the next day. If it is algae of any kind on the glass it will come out
sparkling clean. If it is mineral deposits then you may have to use vinegar
or stronger solutions to try and eliminate it. Some simply cannot be
removed. I have a glass lid on a 55 hex that I have tried everything on and
nothing worked. I'm replacing the glass.

Rick