I had a bad bout of dinos a few years ago. I tried heavy water changes with no avail. I tried no water changes and was left with the same. Blackouts worked for about half a day, but they would always return shortly after removing the covers. I tried blackouts anywhere from 1-8 days, several times. I tried peroxide and peroxide with any of the above treatments. The peroxide treatment seemed to work for a while, but the dinos seemed to develop a resistance to the treatment and I had to up the dose to get results. I gave up on it after a while as it wasn't working. I then tried Kalk to up the pH. It worked in the end. I'm not sure if it was the kalk or the kalk plus blackouts, or even if I did the blackouts with the kalk treatment, but the elevated pH was my key. Do a lot of reading on the matter before you go trying every treatment mentioned in this thread. As you can see, there are many different solutions thought to cure this issue. I'm sure some come from people thinking they have dinos and curing some other infestation and some come from treating different types of dinos that are sensitive to different things. When you do decide on a plan, stick to it and resist the urge to combine treatments midstream. You want to work from one solution to another and find the treatment or combination that works. If you throw multiple treatments at it at once you'll never know if it was an individual component that fixed the problem, or a combination.