Water getting hazy/cloudy

Take a sample of water out of the tank in a clear container. Hold it against a white back ground. It the cloudiness is whiteish then it is a bacterial bloom, if it is greenish in colour then it is an algae bloom. I would guess algae bloom if you are batteling algae in the tank. I just went through this and it can be common even amoungst established tanks.

When you are removing algae from your tank make sure to do it prior to a water change. Then change a large quantity of water, up to 75%. I had to do this for serveral days but my tank is only 20 gallons. Also a complete black out of your tank for 4-5 days can be very helpful.

Since your tank is so large there is always the option of alge killing chemicals that the LFS's carry. I am reluctant to use them as if they kill algae they can't be great for live plants, but it is an option.

Neither the algae or bacteria are harmful but they generally mean high levels of something in the tank, which could be harmful to the fish. So water changes are always a good idea.

Sometimes I find that you need to take a larger volumn of water out and compare it to some fresh tap water. So do a water change and when you have a good gallon or so it should be very obvioius if the water has a green tint to it. If not then likely it is the bacterial bloom and that will eventually settle it out.

Well the trick is to take away all of the algaes food source. That isn't too easy. Lots of water changes sometimes help but often it isn't enough. Getting the plants to use up all the food before the algae does could help but algae tends to be pretty tough when it gets a foot hold. Often the only thing to do is to cover the tank and cut out all light for 4-5 days. This won't hurt your plants too much. But without light the algae and plants can't use the food source and the algae shoudl be the first to die back to a managable level.

go buy 50 bunches of anacharis, works like a charm

Other than fry I don't think there are fish that eat free floating algae. Adding more fish would just create more food for the algae as well.

And after I cahnaged 50% of my tank water every day for a week and still had an algae bloom (which kicked in on the 1 year anniversary of the tank) I doubt that ammonia alone leads to it. There is obviosuly some food source involved though. And of course chemicals is always an option but should probably be left as a last resort.