Help!! Cyano problem

Fans will help drop the temperature it is called evaporation cooling i belive. Just need to keep up with regular maintenance and just let it run it's course just like @TurbosAquatics stated. Chemiclean does work but it is just a quick fix asks most likely be back. You can try bumping up your magnesium up that can help with the cyno problem. It had work for me i ran out at 1800 ppm for a couple months and than let our fall naturally and i want to say i kept it around 1600 ppm o would have to find my book that i wrote it down in i haven't checked mine in snice i moved.

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While I think the HyVee RODI water is much better than tap water I doubt they worry much about 0 TDS. While the jugs are relatively inexpensive it starts to add up. I recommend trying to set up your own RODI system. Either get a new one or look online for a used one. I think there have been one or two for sale on this site.

 

Yes it is called evaporative cooling. A box fan blowing across the surface of the water will lower the temp by 2 degrees on average. I have one on my sump hooked up to my apex. With a small tank, a small fan would work good

Chemi clean will work, you just have to follow the directions precisely or it can wipe out your tank in a hurry.

Drinking water can have high TDS. You need to get the distilled water to get 0 TDS.

I think if you lower your powerheads so the bottom of the tank gets more circulation will help, and try the filter socks with daily changes. In a month you will be in good shape.

 

Use chemi clean in the short term. Then follow all the advice in this thread. The chemi clean will clear it up. There is no reason whatsoever to be scared of this particular "chemical"

 

I think a lot of good suggestions have been made. I have had a bout of cyano and increased flow, good lights, lower temperature, chemiclean and siphoning the sand have helped. I also was doing 25% water changes every week, siphoning the sand. I have a small tank though. For me I think flow and lighting were a problem. I also used to get Hy-Vee's filtered water until I found out it had a lot of ammonia in it and the tds was pretty high. That may be a big problem right there. Chemiclean worked well for me. Good luck!

 

I have been through the cyano issue with all 5 of my tanks. Usually after the first couple months.
Tried all the recommended stuff and suffered the frustration. Here is what I have found works for me

Keep the nitrates and phosphates under control as best you can. Personally, I like using bio pellets in a tumbler in the same sump area as my skimmer and turned the left side of my sumps into a refugium. Have a 10W LED over it and grow macro algae in it seeded it with pods and it keeps the mandarins and others fat and happy.
Clean you sand with a sifter screen as needed, to remove the cyano.

And above all HANG IN THERE as the tank matures the cyano will lose its foothold. This has held true for me in each case. I have found that stability of the tank environment seems to be the key for dealing with the cyano along with patience.

 

I don't know if it will help but I too had recently been fighting a really bad cyano outbreak after putting 2 165W LEDs onto my ~4month old 65gal tank. I had the LEDs, which have independent white/blue levels, set to 30% and 60% for white and blues respectively at the recommendation of the LFS. After reading old T5s don't have the output like they do new and that could lead to algae problems I started upping my lights to where they are now, about 55% and 100% white/blue. This led to a dramatic reduction in the amount of cyano I had in my tank to the point where I could enjoy it more; I still have a little bit so I may up the whites to 60% and see if I can get rid of it completely. I didn't see a mention of what lights specifically you are using but thought I'd share what I had success with.

Disclaimer - My tank does not have any corals in yet so I could do the increase without any ill effects for the moment, time will tell if I can keep the lights where they are once I add corals.