I did the 3 day lights out and it worked for about 2 days. I can see it starting to come back and now its in my sump. Im going to clean my sump and add more live sand to maybe feed the bacteria, after that im going to the microbacter 7.
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I used zeo coral snow and zeo bak ..... dosed every other day for a little over one week and cyano gone ..... and as a bonus, water has never looked more crystal clear!
The tank is 4 years old 75 gallon.
I have a bubble Magus nac6. I shoot for drier skim.
I used to never have cyano but I can't catch whatsoever causing it.
I think mcarroll nails it, however I'm not sure why the rock would also not contain leach-able phosphates. I'm guessing that the rock also is leaching phosphates but that the majority is in the sand-bed and addressing this issue would effectively solve the problem. Phosphate has been shown to adsorb strongly on calcium carbonate - the sand, originally a phosphate sink becomes a phosphate source as the chemistry of the sand bed changes or the environment of the sand bed is changed by bacterial action.
Just for the fun of it, take a scoop of sand from beneath the surface (a couple of tablespoons). Rinse any obvious organics away with tank water. Drain off any residual water and put the sand in a small cup. Pour enough dilute white vinegar over the sand and let sit for a while. Pour off the vinegar and neutralize with some baking soda. Test this solution for phosphate. I don't know what you'll find - but it would be interesting to see if you read more phosphate than in your tank.
robert, can you summarize?
I change my water ever week.
I started using GFO, to get rid of the algae.
cyno does appear in my higher flow areas.
Should I change the water every other week? and take off the GFO? and feed every other day?
This worked good for me.