"Rikko" wrote in message
...

This was the Laguna bagged stuff - I've heard nothing about using
liquid extracts or the like, but I don't know that they would work. I
believe the principle behind it is that the slow decay of the barley
releases enzymes that discourage algae growth.. I can't see a liquid
providing any sort of time release decay.

There are liquid products around that are made from barley extract.
They are supposed to contain the same enzymes -- you simply have
to dose them every few days. I tried one of these for a few months
to see whether I'd make any progress on a slight green water problem
and some green fuzz algae. To me, the stuff didn't seem to be effective.
(Of course, there may have been other issues with my water parameters
at the time that were dominant, so the barley extract couldn't work.)

In general, with algae growth, there is something not quite
in balance in the tank. To me, the best way to address the problem
then is to find out what's not right and address that. If I add
something to an already out-of-balance tank, thereby really
putting it even more out of balance, that seems unlikely to be
remedy for the problem (except maybe as a short-term fix).

Cheers,

Michi.

--
Michi Henning Ph: +61 4 1118-2700
ZeroC, Inc. http://www.zeroc.com