I have a redsea 170 and I'm recently having problems with Cyano. I have brand new bulbs in a ati powermodule. Good flow with an mp10. Not sure if my settings on my fixture could be causing it? Right now the lights about 10" off the water and at about 50%
Something causing Cyano
- Thread starter jmp21677
- Start date
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Age of the tank? Parameters? anything you are dosing or feeding?
hmm. no aminos or carbon dosing? Hows nitrates and phosphates.
For you and the OP. steady PH above 8?
120reefkeeper
Reef keeping with Military Precision!
I'd also like to know where the nitrate and phosphates are at.
mcarroll
10K Club member
Is it a heavy bio-load?
What do you feed and how do you do it?
I would say an mp10 is likely to be minimal flow for a 24 x 20 x 20" tank – they're pretty strong within a foot, and adequate out to about 18". Past that....?
Did the new bulbs seem to bring it on?
The bottom line is that there's a nutrient reservoir – P, for example – that the cyano are outcompeting everything else for.
Too little nitrogen (indicated by ultra-low or zero nitrates) starves out everything else, but cyano can fix N2 when other sources have dried up.
As bacteria, I wouldn't be surprised if they can outcompete everything else for P as well, so zero NO3 and zero PO4 simply means that they're using up the next-most limiting nutrient. I think I've seen Randy suggest that this is likely Fe....but tick off the whole Extended Redfield ratio list for possibilities.
Of course every rule of thumb like Redfield has numerous exceptions, so let's not forget the effect of the Redfield Ratio in Diatoms as well as the effects on C N and P by denitrifying bacteria. (Especially N.)
What do you feed and how do you do it?
I would say an mp10 is likely to be minimal flow for a 24 x 20 x 20" tank – they're pretty strong within a foot, and adequate out to about 18". Past that....?
Did the new bulbs seem to bring it on?
The bottom line is that there's a nutrient reservoir – P, for example – that the cyano are outcompeting everything else for.
Too little nitrogen (indicated by ultra-low or zero nitrates) starves out everything else, but cyano can fix N2 when other sources have dried up.
As bacteria, I wouldn't be surprised if they can outcompete everything else for P as well, so zero NO3 and zero PO4 simply means that they're using up the next-most limiting nutrient. I think I've seen Randy suggest that this is likely Fe....but tick off the whole Extended Redfield ratio list for possibilities.
Of course every rule of thumb like Redfield has numerous exceptions, so let's not forget the effect of the Redfield Ratio in Diatoms as well as the effects on C N and P by denitrifying bacteria. (Especially N.)
mcarroll
10K Club member
Sometimes cyano is as simple as changing your RODI cartridges (or similar), but sometimes it's a lot more tenacious.
It's not quite directly related, but this might be interesting since it does discuss parallel issues:
Bacterivory in algae: A survival strategy during nutrient limitation
(click through to the main journal article if you want to read the whole thing)
It's not quite directly related, but this might be interesting since it does discuss parallel issues:
Bacterivory in algae: A survival strategy during nutrient limitation
(click through to the main journal article if you want to read the whole thing)
