On Sat, 23 Apr 2005 18:06:53 +0100, "qqqq" wrote:

One of my fish has developed a patch on its back near its dorsal fin which
is coloured green with algae.
The fish is sometimes lethargic..
I had this happen to a fish year, and treated it with Protoban, but this
seems not have worked this times.
I have photos if anyone would like to look.
Geoff

Try this website for a diagnosis:
http://homepage.ntlworld.com/duncan.griffiths/Dtree.htm

~ jan

(Do you know where your water quality is?)