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Originally Posted by Son Of Skyline
Once it was all gone, did you have to keep using chemiclean to keep it away or is it one shot and you're done?
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Generally speaking, it is one shot and you're done. In really bad infestations I think it can require a second treatment to totally eradicate.
However for the long term, if the conditions that caused the cyano in the first place, don't change, then the cyano will likely eventually come back.
Cyano is kinda interesting in that it's sort of both like an algae and like a bacteria ... or depending on how you look at it, not really an algae and not really a bacteria. Algae for example, is usually brought on by a nutrient issue and it's growth rate can be predictable based on the nutrient levels and the lights. Cyano on the other hand, while it CAN be triggered by a nutrient level, isn't always, and simply limiting nutrients may not be enough to curtail its growth.
I've had good luck with getting rid of it by keeping tank lights off for a few days, but whether that's a good option or not depends on whether you have things that don't do well in extended darkness or not ..A FOWLR tank though without corals or a tank with mainly softies will likely do just fine for example.