Hi Frank when you say misty is it a white hazy look or does it have a green tinge to the water. You mentioned tropical fish so I am thinking that this is a freshwater setup? Also how are you cleaning your filters? As asked how old is the tank, how long has it been running? Is the water misty all the time or right after water changes or in between water changes. More information is needed to try to help you figure what is going on.
do you have fine sand? i do and if my power head is pointed down at all it starts to kick up sand and make the tank cloudy. Also i have a diamond goby that sand sifts and just from that my tank can get cloudy.
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