adding water

Personally, I believe that when the salinity is highly excessive, it builds
up on the exterior much more readily and with more mass. I usually just add
pure water, and then monitor the hydrometer readings to ensurew that i
maintain adequate salt levels. Mike.
"Tom" wrote in message
om...
I always hear that when water evaporates, you just need to add
unsalted water, since the salt is still in the tank. I don't do this,
I always add salt, and my salinity is pretty constant. I do have lots
of salt up around my light and on the top edges of the tank. Why is
this?