On Tue, 5 Jul 2011 10:22:45 +0100, "john brook"
wrote:

We got some 'water' plants from Ikea that come in a clear plastic cup filled
with water.

Have put them in a south facing window, but the water turns green and algae
forms around the container.


Algae needs light and the minerals in the water to grow and that's it!
Don't use an algaecide as it will kill plants as well. What you could
try is a few red ramshorn snails. They will eat the algae and add a
bit of interest. Most tropical fish shops will have some.

Steve

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