Aquatic Plants Digest V1 #165

>From: "John Y. Ching" <jyching at watnow_uwaterloo.ca>
>Date: Wed, 5 Jul 1995 14:01:04 -0400 (EDT)
>Subject: Algae and Algae eaters
>Some of the new plants I bought the past weekend have developed a 
>fur-like algae on their leaves despite my effort to treat the plants in a 
>bleach solution prior to planting them. I am not sure whether the algae 
>is "normal" green algae or the dreaded brush (red) algae. The color of 
>the algae is kinda dark green, and it tends to cover an entire affected 
>leaf. It also seems to prefer the long and narrower leaves of the swords. 
>How do I tell the difference between green and brush algae? 

I have noticed that red algae (which normally looks dark green) turns 
bright red when exposed to hot water. Take a sample and boil it if you 
want to be sure of what you're dealing with. You can also use tap water 
as long as it gets reasonably hot.