Blooms like you are describing are not blooms in the nitrifying bacteria that we refer to as our biofilter. Rather, they are the myriad normal flora microorganisms that live in our tanks. These organism live in balance normally, one population feeding upon (and controlling) another. Sometimes, often for reasons we can't discern, the populations become unbalanced and you get a bloom. It may be that you're feeding too much, it may be that the fish have grown and your maintenance procedures haven't increased to match... it can be a number of things. Usually, almost always, it will go away in a week or two, occasionally longer, with no intervention. Using a treatment like a water clarifier generally doesn't help (maybe for a day, but the bloom comes back). Similarly, water changes may help, but often the cloudiness comes back in a day or two.
If you can't bear waiting, it sometimes helps to get a couple quarts from a known healthy tank. You might be able to import enough microorganisms to reestablish a balance.
Although a bit unsightly, these blooms usually don't harm anything, so as long as ammonia and nitrite are zero, I wouldn't lose any sleep over it.
HTH,
Jim
