Hi George,
It seems to me you have the same problem as Microbot,
you are both producing large amounts of nutrients (mainly nitrate) in
your canister filters etc. which is encouraging and fuelling the algae
growth, not measurable because the algae is consuming it as fast as
your producing it. Your filtration should consist only of live rock (
about 1.5 to 2lbs per gall of tank capacity, much more than 2lbs will
be counter productive ), the live rock needs to be reasonable size
pieces, ( the bigger the better) small pieces will not generate an
anaerobic area, a DBS, plenty of main tank flow ( 10 tanks per hour
bare minimum, I use 20 or more ) plus a good protein skimmer. This will
take care of your nutrient problem which in turn will take care of the
algae problem, but not over night !! you need plenty of patience with a
marine tank. You could help things along with plenty of nitrate,
phosphate and silicate FREE water changes until you start to see a
reduction in the algae.
regards,
unclenorm.