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White mold

Greetings all,

I've got a 10 gal lightly planted tank with DIY CO2 and a relatively small fish load.  The other day while performing a partial water change  I noticed a fuzzy white mold growing on the inside of the hood, around the lip of the tank, and inside the hang-on filter box just above the water line.  

Is this an indication of something more foul?  Is this harmful to the fish/plants?  I know that mold spores tend to grow in moist areas (e.g. the attraction to the aquarium), but is there anyway to prevent the growth of mold or am I fighting an endless battle?  Also, I live in Florida where the relative humidity stays quite high, especially this time of the year--I'm quite sure this is a factor.

Any help or advice is much appreciated.


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