What makes mold grow on aquarium filter? Too much light or too little?
I recently hooked up my aquarium light to a timer so it goes on at 7 am and off at 7 pm. I used to turn it off and on at 8 am and 6 pm. I noticed there's white furry looking mold growing on the top of my filter where the water doesn't touch. Should I be able to just wipe it off with a paper towel or is it going to reappear? it's a ten gallon tank if that matters. Thanks!
Those are mineral deposits, not mold. Just like hard water stains in a shower, sink, or any other area exposed to water containing minerals, aquarium equipment and glass can get buildup of minerals as the water splashes and evaporates (the dissolved minerals are left behind). All you have to do is wipe it off with a paper towel.
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