This is from another fish forum I belong to. See if it applies to you.
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From the OP's description, it sounds most like a bacterial bloom. This is a sudden, seemingly inexpicable white cloudiness, ranging from a mild haze to milky opacity. If it manages to get to the latter stage, it stinks horrifically, and has the potential to be deadly to fish. The milder, much more common forms are harmless to fish, so far as I've seen.
I've had blooms happen a few times, all with established tanks. I did have the opaque, fatal kind once--no idea what caused it that time--which killed a juvenile senegal bichir and a bunch of apple snails.
Essentially, what you've got with a bacterial bloom is a bunch of anaerobic bacteria--the same that process wastes in your tank--reproducing like crazy in the tank water. Higher waste levels could trigger this. Often blooms occur after changing filter media (which is why you should never change all of your filter media at one time), or removing established substrate: if you remove the bacteria that are processing wastes, the wates will build up until you get an explosion of feasting bacteria.
Water changes will almost always only make it worse, unfortunately, unless you do a full-out 100% change. This is my recommendation. Bucket the fish, shut off the filters, and completely drain the tank, then refill it. It's possible that it might take a few of these full water changes to clear things up for good, but I've never had this method fail.
Anti-bacterial medications will likely knock it back a bit, but, as you've already found with the Jungle product, chemical treatments are only a temporary fix (and you don't want to be killing off the bacteria in your filters.)
Green cloudiness is an algae bloom, or "greenwater" (often abreviated in Asian forums as gw <--there's some trivia for you.) It is caused by excess light, especially sunlight. The only real drawback to greenwater is that you can't see your fish! It is not harmful to the fish in the least. For some fish (such as goldfish) greenwater is even considered to be very healthy, and many owners/breeders (particularly in Asian countries) will encourage it in their tanks and ponds. Greenwater can be gotten rid of through frequent water changes and removal of the problematic light source (i.e.: shading windows.)
Not washing substrate before adding it to a tank can also cause cloudiness, but this is most usually just fine particulates going adrift in the water. If you have a robust filtration system, it can clear the water within hours. Otherwise, you typically have to wait for this dust to settle or filter out, which can take anywhere from hours to weeks, depending on various factors.
