I prewashed my pool filter sand, then put it in the tank then filled the tank with water. The tank at first was really cloudy, but now is only slightly cloudy, but it's still pretty foggy. I was wondering if this will eventually settle or should I start doing water changes. I remember from school that some particles when they get to a certain size, they're classified as colloids and are a stable suspension. Classroom theory doesn't always predict the practical, so I thought I'd ask. Oh, and It's a 30 gallon, which I used to think, before lurking in this forum, is huge. Apparently it's pretty small