"Shorty" wrote in message
oups.com...
I read that cyanobacteria doesn't like water movement and oxygen. I
also read in some places that it appears when nitrates are very low.

There is a large Aquaclear on the tank and a powerhead/aerator at one end
that causes a good circular current in the tank. This also helps keep
"crud" in circulation - better to be picked up by the filter. Nitrates stay
around 20ppm. I don't have the kits to measure potassium and phosphates.
The 55g right next to it, set up exactly the same, has a nice green algae.
This is a real mystery to me. None of the other tanks have this nasty
stuff, all have normal green algae.

I will do a partial water change... and get more water movement and
aeration. I was minimizing aeration to keep the CO2 in the tank but it
might be better to increase CO2 injection and aerate at the same time.
I will also add more nitrate in addition to the regular amounts.

Will let you know what happens.

Yes, keep us informed.
--

Koi-Lo.... frugal ponding since 1995...
Aquariums since 1952
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
Note: There are two Koi-Lo's on the Aquaria groups.
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