The problem is just that the evaporation Shows and Shows and Shows.
You constantly have to fill and clean the top inch of the glass which gets white scum on it.
To many it is not a big deal and if you only have one tank, no problem, but it is EXTRA work.
Again, to many the benefits are far better then the extra work, but to me, maybe not.
They do look great when kept up, but they look extra bad when not.
If you have never had one, get one, everybody should at least try it.
It might not be a big deal to you.
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