I need help with my water

[bubbles]

My tank water keeps turning very green. *I have angel fish only in the tank. *What am I doing wrong? *I have other tanks that don't do this. *Several days after changing water it will always turn back green.

[Bombay]

:-* Bubbles:
What size tank?  What kind of plants, rocks, etc?  How many fish?  What are you water parameters and where is your tank situated?

With a little more info, I will try to help.

Bombay

[Bettaman shane]

Is your tank ycled because my water does this when i don't cycle it and then add fish.

[Matt Nace]

Green water is usually from too many nutrients in the water combined with your lighting.

First, is there plants and do you add any liquid fertilizer to the tank.

Second make sure your nitrates are not high.

How long are your lights on?

Free floating algae is blooming in the tank right now.

You may have to eliminate the source of Nutrients and may have to leave the light off for a day to a few days.

If it is a planted tank, leave the light off a day, and stop adding fertilizer.

You should do a 25%water change every 2 to 3 days for a week.

Make sure you are not having sunlight hit the tank.

When this clears don't leave your lights on for more than 12 hours. After you turn your lights on in a couple days ,at first , I wouldn't leave them on for more than 8. Eventually moving up to a longer time.

It isn't a bad thing if your Nitrates are not high.

Yes, it is algae floating around :P. Just leave the tank and water alone for awhile but keeping a very close watch on your water chemistry. It will clear up. Its part setting up a new tank.

[clothahump]

MaleRubyBarb has the answer to your problems spot on.
If you have access to a UV clarifier run the aquarium water through this for 1-2 weeks,failing this a Diatom filter will remove the algae physically. 8)