hahaha! when it comes to cyanobacteria... I'd say you might be right. If you vacuum as much of it out as possible before you hit the tank with chemiclean, you might be able to beat it back, but it's what comes after that I think we have very little control over. Some people would say to start dosing your tank with one of the pro-biotic solutions available on the market today like microbacter (that's a real thing right?) or Zeoback or something, but I'm uuuuber skeptical of any bacterial supplement that hasn't been refrigerated along it's entire chain of custody. I've tried looking at a few under my microscope and I've never seen anything in those solutions that one could clearly say is alive. Even if they were alive by the time you added them to your tank, the microbiology of bacterial competitive regimes are way too complex and poorly understood for anyone claiming that bacterial product X produces Y effect to have much empirical backup.
At the end of the day, you can't have a problem with problem algae unless you have a problem algae. Why do some tanks get overrun with gross cyano while others look pristine even though they have the same testable parameters? I'd argue part of it is that the species that compose the cyano mat were introduced to one and weren't to the other. If the water can support coral, it can support algae of some kind, but what algae you will have depends as much on the stochasticity of unintentional contamination as your particular nutrient profile.
Ultimately all you can do is try to keep your nutrient profile within the parameters of the system you're trying to emulate and hope for the best lol.
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