Sudden algae problem

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I have a 100 gallon fish tank that has been setup for many years. It
houses a few japanese koi and a plecto algae eater. Although we have
never had an algae problem before, for some reason, the tank is now
covered in algae. We tried cleaning the tank, replacing the charcoal
filter in the Fluval and the algae quickly reappeared. We have not
changed anything... same number of fish, same food, same location,
same filter, .... Any ideas why we have a sudden algae problem and any
idea how to resolve?

[gerfish]

Are you sure all of your fish are still alive ??
Or has your water supply quality changed ? Might do no harm to test the
water you use for Water changes

HTH
Ger

[Billy]

> wrote in message
oups.com...
>I have a 100 gallon fish tank that has been setup for many years.
>It
> houses a few japanese koi and a plecto algae eater. Although we
> have
> never had an algae problem before, for some reason, the tank is now
> covered in algae. We tried cleaning the tank, replacing the
> charcoal
> filter in the Fluval and the algae quickly reappeared. We have not
> changed anything... same number of fish, same food, same location,
> same filter, .... Any ideas why we have a sudden algae problem and
> any
> idea how to resolve?


How big is the pleco? Once they reach a certain size, many of them
will cease to eat algae. As an aside, charcoal filtration will not
have any affect on algae growth. Activated carbon, as it's more
commonly called, can remove discolorations, medications, and a small
number of toxins from the water.
Post a little more info on your tank, such as lighting and water
parameters, and we'll help you take this apart. <g>

billy