cynobacteria/red slime algae

kannarajesh

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May 5, 2004
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I had previous written on this message board about the sudden, rapid growth of cynobacteria in my aquarium.. Though everything seemed in place. salinity, ph, nitrates, nitrites, amonia, calcium, my fishes in the tank died (the last one today)
the coral aquarium (50 gallons) seems to be fine. However i do have to syphon out the slime algae once in a week.

One of the store guys suggested us, that we switch off the lights of the (ex-) fish tank for a while, and this would eradicate the cynobacteria. He also suggested that we switch on the lights over the coral tank every alternate day. I am against this... i am not very sure, about the corals surviving with such minimal lighting. Also, now the corals are seemingly healthy.

Please help me with your suggestions.
I am thinking of changing the gravel, and placing some live rocks, and increasing the water flow at places, in the fish tank.
thanks.
 
well from looking at your water parameters I'd say that you're on the right track with increasing your water flow rate. Lots of times if you get still pockets in your water you'll get a cyano bloom. What killed your fish did they have an infection or a parasite? If they did if you'll give your tank from a month to 6 weeks what ever was infecting it should have ran it's course. You'll want to lightly feed every couple of days to keep your bacteria alive though.
sorry for your loss
chris
 
Wow, I'm very sorry.

If you have coarse gravel in the fish tank, this is probably a good time to replace it with fine sand. I like your idea of more live rock too.

I am really puzzled about the appearance of cyano and the sudden deaths. Like something was released that fed the bloom and killed your fish. But left the corals intact. Very puzzling.

It probably wouldn't hurt to reduce the light on the corals in the short term, but it won't really help in the long term if you don't find the fuel for the cyano.

One thing you haven't mentioned is phosphate. Because cyanobacteria can fix their own nitrogen, they are often more limited by phosphate than nitrate. Just a guess.
 
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